If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?
Options:
(A) 22 1/8 %
(B) 22 9/2 %
(C) 22 1/7 %
(D) 22 1/2 %
(E) 21 1/2 %

9 = (1*40*R)/100
R = 22 1/2 % So the answer is: (D).

Divide Rs.32000 in the ratio 3:5?
Options:
(A) 12000,20000
(B) 12000,20092
(C) 12000,20029
(D) 12000,20007
(E) 12000,20001

3/8 * 32000 = 12000
5/8 * 32000 = 20000 So the answer is: (A).

A man rows his boat 80 km downstream and 38 km upstream, taking 3 hours each time. Find the speed of the stream?
Options:
(A) 6
(B) 9
(C) 7
(D) 8
(E) 2

Speed downstream = d/t = 80/(3) = 27 kmph
Speed upstream = d/t = 38/(3) = 9 kmph
The speed of the stream = (27 - 9)/2 = 9 kmph So the answer is: (B).

The speed of a car is 90 km in the first hour and 60 km in the second hour. What is the average speed of the car?
Options:
(A) 228
(B) 75
(C) 299
(D) 267
(E) 312
S = (90 + 60)/2 = 75 kmph So the answer is: (B).