At what rate percent per annum will the simple interest on a sum of money be 6/5 of the amount in 10 years?  Select:
A) 4 %
B) 7 %
C) 9 %
D) 3 %
E) 12 %

Rationale: "let sum = x . then , s . i . = 6 x / 5 , time = 10 years . rate = ( 100 * 6 x ) / ( x * 5 * 10 ) = 12 % answer : e"
Answer: E