Answer: (A)
Question: The compound ratio of 2/3, 6/7, 4/3 and 1/8 is given by?
Options:
(A) 2/21
(B) 1/48
(C) 1/98
(D) 1/96
(E) 1/68
[CoT]: [2/3 * 6/7 * 4/3 * 1/8 = 48/504 = 2/21]

Answer: (B)
Question: Find the average of the series : 312, 162, 132, 147 and 122?
Options:
(A) 170
(B) 175
(C) 180
(D) 185
(E) 195
[CoT]: [Average = (312 + 162 + 132 + 147+ 122)/5 = 875/5 = 175]

Answer: (A)
Question: The value of a machine depreciates at the rate of 10% every year. It was purchased 3 years ago. If its present value is Rs. 8748, its purchase price was :
Options:
(A) 12000
(B) 10000
(C) 15000
(D) 20000
(E) 25000
[CoT]: [Purchase = 8748/(1-10/100^3) = 12000]

Answer: (B)
Question:
In order to obtain an income of Rs. 650 from 10% stock at Rs. 96, one must make an investment of:
Options:
(A) Rs. 3100
(B) Rs. 6240
(C) Rs. 6500
(D) Rs. 9600
(E) Rs. 8600
[CoT]: [To get Rs. 10, Investment is 96
To get Rs. 650, investment is (96/10)*650 = 6240]