A sum of money invested at C.I. amounts to Rs. 800 in 3 years to Rs. 860 in 4 years. The rate of interest per annum is? Choose one:	A) 2 1/2 %	B) 4%	C) 5%	D) 6 2/3 %	E) 7 1/2%
S.I. on Rs. 800 for 1 year = (860 - 800) = Rs. 60 Rate = (100 * 60)/(800 * 1) = 7 1/2%   ANSW7 1/2%R:7 1/2%
<result>E</result>
A sum of money invested at C.I. amounts to Rs. 800 in 3 years to Rs. 860 in 4 years. The rate of interest per annum is?