All questions please

2.  The measure of the largest angle of a quadrilateral if measures of its interior angles are in the ratio 3 : 4 : 5 : 6 is
$\left(a\right) 60° \left(b\right) 120° \left(c\right) 90° \left(d\right) cannot be determined$

3.  The difference between the simple interest and compound interest on a certain sum of money, for 2 years at
4 %  p.a is Rs 20.
The sum is (a)  Rs 13,500                  (b)  Rs 12,500               (c)  Rs 11,500                       (d)  Rs 15,200

4.  If x : y = 5 : 2, then ( 8x + 9y) : (8x + 2y) is
(a) 22 : 29                         (b)  26 : 61                 (c)  29 : 22                           (d)  61 : 26

5. A merchant marks his goods at Rs 300 and allows a discount of 25%. The cost price of the goods is
(a) Rs 220                  (b) Rs 200                (c)  Rs 240                     (d) Rs 260

6.  Successive discounts of 10% and 20% are equivalent to a single discount of
(a)  30%                           (b)  15%                      (c)  72%                             (d)  28%

7.  If 50 % of (x - y) = 30% of (x+y), then, x = ky. The value of k is
(a)  2                          (b)  8                           (c)  4                                   (d) 1

8.  A sum of money invested at compound interest amounts to Rs 800 in 3 years and to Rs 840 in 4 years. The rate of interest per annum is
$\left(a\right) 2\frac{1}{2}\% \left(b\right) 4\% \left(c\right) 5\% \left(d\right) 6\frac{2}{3}\%$