a) Rs. 400
b) Rs. 300
c) Rs. 350
d) Rs. 405
Answer: a
Explanation:
$$\eqalign{
& {\text{Rate of interest 5}}\% \cr
& = \frac{1}{{20}} \cr
& {\text{Let principal}} \cr
& {\text{ = }}{\left( {20} \right)^2}{\text{ = 400 units}} \cr
& \Rightarrow {\text{ Total compound interest }} \cr
& {\text{41 Units }} \to {\text{Rs. 410 }} \cr
& {\text{1 Units }} \to {\text{Rs. 10 }} \cr
& {\text{400 Units }} \to {\text{Rs. 400 }} \cr
& {\text{Total simple interest}} \cr
& {\text{ = Rs. 400}} \cr} $$
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