A sum of money becomes 7/6 of itself in 5 years at a certain rate of simple interest. The rate per annum is?
Choose the correct choice from the following options:
A) 20 / 7 B) 20 / 3 C) 23 / 6 D) 10 / 3 E) 10 / 7

Rationale: "let sum = x . then , amount = 7 x / 6 s . i . = 7 x / 6 - x = x / 6 ; time = 5 years . rate = ( 100 * x ) / ( x * 6 * 5 ) = 10 / 3 % . answer : d"
Answer: D