1.  The simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on ₹ 4000 for 2 years at 10% per annum. The sum placed on simple interest is:

A. ₹ 1550
B. ₹ 1650
C. ₹ 1750
D. ₹ 2000

Answer: Option C

Explanation:

C.I.
= ₹ 4000 x 1 + 10 2 - 4000
100
= ₹ 4000 x 11 x 11 - 4000
10 10
= ₹ 840.

∴ Sum = Rs. 420 x 100 = ₹ 1750.
3 x 8