Simple interest on a sum at 4% per annum for 2 years is Rs.80. The C.I. on the same sum for the same period is?  Select the correct option:
A) Rs.81.60
B) Rs.160
C) Rs.172
D) Rs.727
E) Rs.728
SI = 40 + 40   CI = 40 + 40 + 1.6= 
<gadget id="calculator">40 + 40 + 1.6</gadget>
<output>81.6</output>
81.6   Rs.81.60nswer:Rs.81.60
<result>A</result>
Simple interest on a sum at 4% per annum for 2 years is Rs.80. The C.I. on the same sum for the same period is?