q: Rs.500 amounts to Rs.670 in 5 years at simple interest. If the interest is increased by 2%, it would amount to how much?
Options:
(A) 150
(B) 550
(C) 760
(D) 450
(E) 260
a: OK... (500*5*2)/100 = 50
500+ 50 = 550
The answer is (B).

q: The average amount with a group of seven numbers is Rs. 20. If the newly joined member has Rs. 50 with him, what was the average amount with the group before his joining the group?
Options:
(A) 28
(B) 27
(C) 15
(D) 19
(E) 12
a: OK... Total members in the group = 7
Average amount = Rs. 20
Total amount with them = 7 * 20 = Rs. 140
One number has Rs. 50. So, the amount with remaining 6 people = 140 - 50 = Rs. 90
The average amount with them = 90/6 = Rs. 15.
The answer is (C).

q: A man purchased 3 blankets @ Rs.100 each, 5 blankets @ Rs.150 each and two blankets at a certain rate which is now slipped off from his memory. But he remembers that the average price of the blankets was Rs.150. Find the unknown rate of two blankets?
Options:
(A) 450
(B) 200
(C) 250
(D) 300
(E) 350
a:
OK... 10 * 150 = 1500
3 * 100 + 5 * 150 = 1050
1500 1050 = 450
The answer is (A).