q: What amount does Kiran get if he invests Rs. 18000 at 15% p.a. simple interest for five years?
Options:
(A) 31500
(B) 27773
(C) 29989
(D) 28800
(E) 29883
a: OK... Simple interest = (18000 * 5 * 15)/100 = Rs. 13500
Amount = P + I = 18000 + 13500 = Rs. 31500
The answer is (A).

q: How many numbers can be made with digits 0, 7, 8 which are greater than 0 and less than a million?
Options:
(A) 496
(B) 486
(C) 1084
(D) 728
(E) 628
a: OK... The number of single digit numbers = 2
The number of 2 digit numbers = 2 3 = 6
The number of 3 digit numbers = 2 3 3 = 18
The number of 4 digit numbers = 2 3 3 3 = 54
The number of 5 digit numbers = 2 3 3 3 3 = 162
The number of 6 digit numbers = 2 3 3 3 3 3 = 486
Therefore, the total numbers = 728
The answer is (D).

q: Find the area of the quadrilateral of one of its diagonals is 20 cm and its off sets 9 cm and 6 cm?
Options:
(A) 128
(B) 150
(C) 882
(D) 272
(E) 121
a:
OK... 1/2 * 20(9 + 6) = 150 cm2
The answer is (B).