1) If in a certain number of years Rs. 3000 amounts to Rs. 4320 at compound interest, in half that time Rs. 3000 will amount to A) Rs. 3200 B) Rs. 3560 C) Rs.3600 D) Rs.3800 E) Rs. 3805 Answer: Option CExplanation:Let rate of interest =R% Number of years =N 4320 =3000(1+R100)N (1+R100)N/2 =√1.44 =1.2 In n2 years Rs. 3000 will amount to 3000(1+R100)N/2 =3000×1.2 = Rs. 3600.