plz answer these question i have got my exams on sunday fast plz :)))))) 1 in what time is Rs5600 - Maths - Statistics

Question

plz answer these question i have got my exams on sunday fast plz
:))))))
1 in what time is Rs5600 amount to Rs6720 at 8% per annum?
2 what amount a person will get after 2 5 years at 8% per annum
if he invested Rs2650 in the bank?
3 What sum will amount to Rs5525 at 10% per annum simple
interest in 3 years?

Ajanta Trivedi · Accepted Answer

1 principal P = Rs 5600 , Amount A = Rs 6720 , rate of interest R = 8% per annum simple interest SI = Amount - principal = 6720-5600= Rs 1120 let the time be T years $S I = \frac{P R T}{100}$ $1120 = \frac{5600 * 8 * T}{100} T = \frac{1120}{56 * 8} = 2 5 y e a r s$ thus the required time is $2 \frac{1}{2} y e a r s$ 2 Principal P = Rs 2650 , Time T = 2 5 years, rate of interest R = 8% per annum $S I = \frac{P R T}{100} S I = \frac{2650 * 8 * 2 5}{100} = 530$ Amount = Principal + simple interest = Rs 2650+530 Amount = Rs 3180 thus he will get Rs 3180 3 let the principal be Rs 100 Time T = 3 years , rate of interest R = 10 % per annum $S I = \frac{P R T}{100} S I = \frac{100 * 10 * 3}{100} = R s 30$ Amount = principal + simple interest = 100+30= Rs 130 if the amount is Rs 130 principal = Rs 100 if the amount is Rs 5525 , principal = $\frac{100}{130} * 5525 = R s 4250$ thus Rs 4250 will amount to Rs 5525 in 3 years at 10% per annum hope this helps you