a) Rs. 3000
b) Rs. 4000
c) Rs. 6500
d) Rs. 5000
Answer: d
Explanation: Difference between their rates he gained from both boys
$$\eqalign{
& \Rightarrow (15 \times 5)\% – (12 \times 4)\% \cr
& \Rightarrow 75\% – 48\% \cr
& 27\% = 1350{\text{ }}({\text{given)}} \cr
& 100\% = {\text{Rs}}{\text{. 5000}} \cr} $$
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