A sum of money becomes 7/6 of itself in 6 years at a certain rate of simple interest. The rate per annum is? Choose the correct answer:
A) 50/9	B) 50/13	C) 50/17	D) 25/9	E) 5 5/1
Let sum = x. Then, amount = 7x/6   S.I. = 7x/6 - x = x/6; Time = 6 years.   Rate = (100 * x) / (x * 6 * 6) = 25/9 %.   Answer:25/9
<result>D</result>
A sum of money becomes 7/6 of itself in 6 years at a certain rate of simple interest. The rate per annum is?