A man gets a simple interest of Rs.300 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?	Pick:
A) s.256 B) s.315 C) s.415 D) s.514 E) s.615
Let the principal be Rs.P   S.I at 5% p.a in 2 years on Rs.P = Rs.300   (P)(2)(5)/100 = 300   P = 3000   C.I on Rs.2P i.e., Rs.6000 at 5% p.a in two years   =6000{ [1 + 5/100]^2 - 1}   = 6000(41/400)   = Rs.615   Answer:s.615
<result>E</result>
A man gets a simple interest of Rs.300 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?