A sum of money becomes 7/6 of itself in 2 years at a certain rate of simple interest. The rate per annum is?	Choose the correct choice from the following answers.
A) 50 / 9
B) 50 / 7
C) 50 / 6
D) 50 / 8
E) 50 / 3

Rationale: "let sum = x . then , amount = 7 x / 6 s . i . = 7 x / 6 - x = x / 6 ; time = 2 years . rate = ( 100 * x ) / ( x * 6 * 2 ) = 50 / 6 % . answer : c"
Answer: C