A sum of money becomes 7/6 of itself in 6 years at a certain rate of simple interest. The rate per annum is? Choices:	A) 50 / 9	B) 50 / 13	C) 50 / 17	D) 25 / 9	E) 5 5 / 1

Rationale: "let sum = x . then , amount = 7 x / 6 s . i . = 7 x / 6 - x = x / 6 ; time = 6 years . rate = ( 100 * x ) / ( x * 6 * 6 ) = 25 / 9 % . answer : d"
Answer: D