A) Rs. 32
B) Rs. 36
C) Rs. 40
D) Rs. 48
Correct Answer: C
$ \therefore $ First SP = Rs. 110 Second CP = Rs. 90 $ Profit=\frac{50}{3} $ %
$ \therefore $ Second SP $ =( 100+\frac{50}{3} ) $ % of 90 $ =90\times \frac{350}{300}=Rs\text{.}105 $ Difference of SP $ =Rs\text{.}\text{(110}-\text{105)}=Rs\text{.}5 $
$ \therefore $ If the difference is Rs. 5, then the CP = Rs. 100
$ \Rightarrow $ If the difference is 7 2, then the CP $ =\frac{100}{5}\times 2=Rs\text{.}40 $