At what rate percent of simple interest will a sum of money double itself in 66 years?	Choose one.
A) 6.54 %  B) 4.54 %  C) 1.51 %  D) 1.94 %  E) 5.54 %

Rationale: "let sum = x . then , s . i . = x . rate = ( 100 * s . i . ) / ( p * t ) = ( 100 * x ) / ( x * 66 ) = 100 / 66 = 1.51 % answer : c"
Answer: C