A certain sum amounts to Rs.675 in 3 years and Rs.850 in 6 years. Find the rate % per annum? Choose the correct answer:
A) 10%  B) 8%  C) 11%  D) 9%  E) 7%
3 --- 675   6 --- 850   --------------   3 --- 175   N = 1 I = 55 R = ?   P = 675 - 175= 
<gadget id="calculator">675 - 175</gadget>
<output>500</output>
500   55= (500*1*R)/100   R = 11%   Answer: 11%
<result>C</result>
A certain sum amounts to Rs.675 in 3 years and Rs.850 in 6 years. Find the rate % per annum?