Rs Aggarwal 2020 2021 Solutions for Class 7 Maths Chapter 12 Simple Interest are provided here with simple step-by-step explanations. These solutions for Simple Interest are extremely popular among Class 7 students for Maths Simple Interest Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Rs Aggarwal 2020 2021 Book of Class 7 Maths Chapter 12 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Rs Aggarwal 2020 2021 Solutions. All Rs Aggarwal 2020 2021 Solutions for class Class 7 Maths are prepared by experts and are 100% accurate.

#### Question 1:

Find the simple interest and the amount when:

Principal = Rs 6400, rate = 6% p.a. and time = 2 years

#### Question 2:

Find the simple interest and the amount when:

Principal = Rs 2650, rate = 8% p.a. and time = $2\frac{1}{2}$ years

#### Question 3:

Find the simple interest and the amount when:

Principal = Rs 1500, rate = 12% p.a. and time = 3 years 3 months.

#### Question 4:

Find the simple interest and the amount when:

Principal = Rs 9600, rate = $7\frac{1}{2}%$ p.a. and time = 5 months.

#### Question 5:

Find the simple interest and the amount when:

Principal = Rs 5000, rate = 9% p.a. and time = 146 days.

#### Question 6:

Find the time when:

Principal = Rs 6400, SI = Rs 1152 and rate = 6% p.a.

#### Question 7:

Find the time when:

Principal = Rs 9540, SI = Rs 1908 and rate = 8% p.a.

#### Question 8:

Find the time when:

Principal = Rs 5000, amount = Rs 6450 and rate = 12% p.a.

#### Question 9:

Find the rate when:

Principal = Rs 8250, SI = Rs 1100 and time = 2 years.

#### Question 10:

Find the rate when:

Principal = Rs 5200, SI = Rs 975 and time = $2\frac{1}{2}$ years.

#### Question 11:

Find the rate when:

Principal = Rs 3560, amount = Rs 4521.20 and time = 3 years.

#### Question 12:

Shanta borrowed Rs 6000 from the State Bank of India for 3 years 8 months at 12% per annum. What amount will clear off her debt?

#### Question 13:

Hari borrowed Rs 12600 from a moneylender at 15% per annum simple interest. After 3 years, he paid Rs 7070 and gave a goat to clear off the debt. What is the cost of the goat?

#### Question 14:

The simple interest on a certain sum for 3 years at 10% per annum is Rs 829.50. Find the sum.

#### Question 15:

A sum when reckoned at $7\frac{1}{2}%$ per annum amounts to Rs 3920 in 3 years. Find the sum

#### Question 16:

A sum of money put at 11% per annum amounts to Rs 4491 in 2 years 3 months. What will it amount to in 3 years at the same rate?

#### Question 17:

A sum of money invested at 8% per annum amounts to Rs 12122 in 2 years. What will it amount to in 2 years 8 months at 9% per annum?

#### Question 18:

At what rate per cent per annum will Rs 3600 amount to Rs 4734 in $3\frac{1}{2}$ years?

#### Question 19:

If Rs 640 amounts to Rs 768 in 2 years 6 months, what will Rs 850 amount to in 3 years at the same rate per cent per annum?

#### Question 20:

In what time will Rs 5600 amount to Rs 6720 at 8% per annum?

#### Question 21:

A sum of money becomes $\frac{8}{5}$ of itself in 5 years at a certain rate of simple interest. Find the rate of interest.

#### Question 22:

A sum of money lent at simple interest amounts to Rs 783 in 2 years and to Rs 837 in 3 years. Find the sum and the rate per cent per annum.

#### Question 23:

A sum of money lent at simple interest amount to Rs 4745 in 3 years and to Rs 5475 in 5 years. Find the sum and the rate per cent per annum.

#### Question 24:

Divide Rs 3000 into two parts such that the simple interest on the first part for 4 years at 8% per annum is equal to the simple interest on the second part for 2 years at 9% per annum.

#### Question 25:

Divide Rs 3600 into two parts such that if one part be lent at 9% per annum and the other at 10% per annum, the total annum income is Rs 333.

#### Question 1:

Mark (✓) against the correct answer
The simple interest on Rs 6250 at 4% per annum for 6 months is

(a) Rs 125
(b) Rs 150
(c) Rs 175
(d) Rs 135

#### Question 2:

Mark (✓) against the correct answer
A sum amounts to Rs 3605 in 219 days at 5% per annum. The sum is

(a) Rs 3250
(b) Rs 3500
(c) Rs 3400
(d) Rs 3550

(b)  Rs.3500

#### Question 3:

Mark (✓) against the correct answer
At simple interest a sum becomes $\frac{6}{5}$ of itself in $2\frac{1}{2}$ years. The rate of interest per annum is

(a) 6%
(b) $7\frac{1}{2}%$
(c) 8%
(d) 9%

(c) 8%

#### Question 4:

Mark (✓) against the correct answer
In what time will Rs 8000 amount to Rs 8360 at 6% per annum simple interest?

(a) 8 months
(b) 9 months
(c) $1\frac{1}{4}$ years
(d) $1\frac{1}{2}$ years

(b) 9 months

#### Question 5:

Mark (✓) against the correct answer
At what rate per cent annum simple interest will a sum double itself in 10 years?

(a) 8%
(b) 10%
(c) 12%
(d) $12\frac{1}{2}%$

(b) 10%

#### Question 6:

Mark (✓) against the correct answer
The simple interest at x% per annum for x years will be Rs x on a sum of

(a) Rs x
(b) Rs 100x
(c) $\mathrm{Rs}\left(\frac{100}{x}\right)$
(d) $\mathrm{Rs}\left(\frac{100}{{x}^{2}}\right)$

(c) Rs. $\left(\frac{100}{x}\right)$

#### Question 7:

Mark (✓) against the correct answer
The simple interest on a sum for 5 years is $\frac{2}{5}$ of the sum. The rate per cent per annum is

(a) 10%
(b) 8%
(c) 6%
(d) $12\frac{1}{2}%$

(b) 8%

#### Question 8:

Mark (✓) against the correct answer
A borrows Rs 8000 at 12% per annum simple interest and B borrows Rs 9100 at 10% per annum simple interest. In how many years will their amounts be equal?

(a) 18 years
(b) 20 years
(c) 22 years
(d) 24 years

(c) 22 years

#### Question 9:

Mark (✓) against the correct answer
A sum of Rs 600 amounts of Rs 720 in 4 years. What will it amount to if the rate of interest is increased by 2%?

(a) Rs 724
(b) Rs 648
(c) Rs 768
(d) Rs 792

(c) Rs. 768

#### Question 10:

Mark (✓) against the correct answer
x, y and z are three sums of money such that y is the simple interest on x and z is the simple interest on y for the same time and same rate. Which of the following is correct?

(a) xyz = 1
(b) z2 = xy
(c) x2 = yz
(d) y2 = zx

(d) y2 = zx

#### Question 11:

Mark (✓) against the correct answer
In how much time would the simple interest on a certain sum be 0.125 times the principal at 10% per annum?

(a) $1\frac{1}{4}$ years
(b) $1\frac{3}{4}$ years
(c) $2\frac{1}{4}$ years
(d) $2\frac{3}{4}$ years

(a)

#### Question 12:

Mark (✓) against the correct answer
At which sum will the simple interest at the rate of $3\frac{3}{4}%$ per annum be Rs 210 in $2\frac{1}{3}$ years?

(a) Rs 1580
(b) Rs 2400
(c) Rs 2800
(d) none of these

(b) Rs 2400

#### Question 1:

Find the simple interest on Rs 6300 at 8% per annum for 8 months.

#### Question 2:

What sum will amount to Rs 6600 in 2 years at 10% per annum simple interest?

#### Question 3:

At what rate per cent per annum simple interest will Rs 3625 amount to Rs 4495 in 2 years?

#### Question 4:

In what time will Rs 3600 amount to Rs 4410 at 9% per annum simple interest?

#### Question 5:

At what rate per cent per annum simple interest will a sum double itself in 12 years?

#### Question 6:

A sum of money becomes $\frac{4}{3}$ of itself in 6 years at a certain rate of simple interest. Find the rate of interest.

#### Question 7:

Mark (✓) against the correct answer
At simple interest a sum becomes $\frac{49}{40}$ of itself in $2\frac{1}{2}$ years. The rate of interest per annum is
(a) 7%
(b) 8%
(c) 9%
(d) 12%

(c) 9%

#### Question 8:

Mark (✓) against the correct answer
A sum amounts to Rs 3626 in 219 days at 6% per annum simple interest. The sum is

(a) Rs 3000
(b) Rs 3200
(c) Rs 3500
(d) Rs 3600

(c) 3500

#### Question 9:

Mark (✓) against the correct answer
In what time will Rs 6000 amount to Rs 6360 at 8% per annum simple interest?

(a) 9 months
(b) 8 months
(c) $1\frac{1}{4}$  years
(d) $1\frac{1}{2}$ years

(a) 9 months

#### Question 10:

Mark (✓) against the correct answer
The simple interest on a sum for 5 yars is $\frac{3}{5}$ of the sum. The rate per cent per annum is
(a) 8%
(b) 10%
(c) 12%
(d) $12\frac{1}{2}%$

#### Question 11:

Mark (✓) against the correct answer
The simple interest at x% per annum for x years will be Rs x on a sum of

(a) Rs x
(b) Rs 10 x
(c) Rs 100 x
(d) Rs $\left(\frac{100}{x}\right)$

#### Question 12:

Mark (✓) against the correct answer
At what rate per cent per annum simple interest will a sum double itself in 10 years?

(a) 8%
(b) 10%
(c) 12%
(d) $12\frac{1}{2}%$

#### Question 13:

Fill in the blanks.

(i) $P=\frac{100×\left(......\right)}{R×T}$
(ii) $R=\frac{100×\mathrm{SI}}{\left(......\right)×T}$
(iii) At (......)% per annum simple interest a sum doubles itself in 10 years.
(iv) At simple interest a sum becomes $\frac{6}{5}$ of itself in $2\frac{1}{2}$ years. The rate of interest is (......)% per annum.

#### Question 14:

Write 'T' for true and 'F' for false

(i) Simple interest on Rs x for x years is Rs x. Then, the rate of interest is x% per annum.
(ii) Rate = $\frac{100×\mathrm{SI}}{P×T}$.
(iii) A sum doubles itself at simple interest at 10% per annum in 10 years.
(iv) Simple interest on Rs 1000 at 5% per annum for 73 days is Rs 10.