A man gets a simple interest of Rs.600 on a certain principal at the rate of 5% p.a in two years. Find the compound interest the man will get on twice the principal in two years at the same rate?
Choose the correct answer:  A) s.1000  B) s.1056  C) s.1150  D) s.1230  E) s.1256
Let the principal be Rs.P   S.I at 5% p.a in 2 years on Rs.P = Rs.600   (P)(2)(5)/100 = 600   P = 6000   C.I on Rs.2P i.e., Rs.12000 at 5% p.a in two years   =12000{ [1 + 5/100]^2 - 1}   = 12000(41/ 400)   = Rs.1230   Answer:s.1230
<result>D</result>
A man gets a simple interest of Rs.600 on a certain principal at the rate of 5% p.a in two years. Find the compound interest the man will get on twice the principal in two years at the same rate?