30.Simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4000 for 2 years at 10% per annum. The sum placed on simple interest is
A. Rs. 1550 B. Rs. 1650
C. Rs. 1750 D. Rs. 2000
Answer:
C.I. =Rs[4000x(1+10/100)²-4000]
Rs.(4000x11/10x11/10-4000) = Rs.940.
Sum =Rs. [420x100 /3x8]
= Rs.1750.
