P = (P*30*R)/100
R = 3 1/3%
At what rate percent on simple interest will a sum of money double itself in 30 years?
Options:
(A) 3 1/9%
(B) 3 7/3%
(C) 7 1/3%
(D) 5 1/3%
(E) 1 1/3%
(A)

100 * 100 = 10000
125 * 80 = 10000
The length of a rectangle is increased by 25% and its breadth is decreased by 20%. What is the effect on its area?
Options:
(A) 1288
(B) 1299
(C) 1000
(D) 10000
(E) 2887
(D)

Speed downstream = 40 + 20 = 60 kmph
Speed upstream = 40 - 20 = 20 kmph
The speed of a boat in still water is 40kmph and the speed of the current is 20kmph. Find the speed downstream and upstream?
Options:
(A) 22 kmph
(B) 40 kmph
(C) 20 kmph
(D) 15 kmph
(E) 23 kmph
(C)