What will be the simple interest earned on an amount of Rs. 16,800 in 9 months at the rate of $$6\frac{1}{4}$$ % p.a. ?
a) Rs. 787.50
b) Rs. 812.50
c) Rs. 860
d) Rs. 887.50
Answer: a
Explanation:
$$\eqalign{
& {\text{P}} = {\text{Rs}}{\text{. }}16800 \cr
& {\text{R}} = 6\frac{1}{4}\% = \frac{{25}}{4}\% \cr
& {\text{T}} = 9\,{\text{months}} = \frac{3}{4}{\text{yr}}{\text{.}} \cr
& {\text{S}}{\text{.I}}{\text{.}} = {\text{Rs}}{\text{.}}\left( {16800 \times \frac{{25}}{4} \times \frac{3}{4} \times \frac{1}{{100}}} \right) \cr
& = {\text{Rs}}{\text{.}}\,787.50 \cr} $$
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