a) Rs. 16000
b) Rs. 15000
c) Rs. 12000
d) Rs. 10000
Answer: a
Explanation:
$$\eqalign{
& P\left[ {{{\left( {\frac{{21}}{{20}}} \right)}^3} – 1 – \frac{3}{{20}}} \right] = 122 \cr
& P\left[ {\frac{{{{21}^3} – {{20}^3} – 3 \times {{20}^2}}}{{{{20}^3}}}} \right] = 122 \cr
& P\left[ {\frac{{9261 – 8000 – 1200}}{{8000}}} \right] = 122 \cr
& P \times \frac{{61}}{{8000}} = 122 \cr
& P = \frac{{8000 \times 122}}{{61}} \cr
& P = {\text{Rs}}{\text{.}}\,16000 \cr} $$
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