At what rate percent per annum will a sum of money double in 2 years.  Options
A) 34% B) 50% C) 11.5% D) 20% E) 21.5%
Let principal = P, Then, S.I.=P and Time=8 years   Rate = [(100 x P)/ (P x 2)]% = 50% per annum. Answer: 50%
<result>B</result>
At what rate percent per annum will a sum of money double in 2 years.