a) Rs. 82.60
b) Rs. 82.20
c) Rs. 81.80
d) Rs. 81.60
Answer: d
Explanation:
$$\eqalign{
& {\text{Rate }}\% {\text{ = 4}}\% \cr
& {\text{Time (}}{{\text{t}}_1}) = 2\,{\text{years}} \cr
& {\text{SI for 2 years}} \cr
& {\text{ = 4}} \times {\text{2 = 8}}\% \cr
& {\text{CI for 2 years}} \cr
& {\text{ = 4 + 4 + }}\frac{{4 \times 4}}{{100}} \cr
& = 8.16\% \cr
& \operatorname{Required} \,CI = \frac{{80}}{8} \times 8.16 \cr
& = Rs.\,81.60 \cr} $$
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