A sum of money becomes 7/6 of itself in 5 years at a certain rate of simple interest. The rate per annum is?	Select the correct option:
A) 20/7
B) 20/3
C) 23/6
D) 10/3
E) 10/7
Let sum = x. Then, amount = 7x/6   S.I. = 7x/6 - x = x/6; Time = 5 years.   Rate = (100 * x) / (x * 6 * 5) = 10/3 %.   Answer:10/3
<result>D</result>
A sum of money becomes 7/6 of itself in 5 years at a certain rate of simple interest. The rate per annum is?