Ramesh sold a book at a loss of 30%. If he has sold it for Rs. 140 more, he would have made a profit of 40%. The cost price of the book is = ?
A. Rs. 280
B. Rs. 200
C. Rs. 260
D. Rs. 300
Answer: Option B
Solution(By Examveda Team)
$$\eqalign{ & {\text{Loss}} = 30\% \cr & {\text{Let}}\,{\text{CP}} = x \cr & {\text{Loss}}\% = \frac{{{\text{CP}} - {\text{SP}}}}{{{\text{CP}}}} \times 100 \cr & \Rightarrow \frac{{30}}{{100}} = \frac{{x - {\text{SP}}}}{x} \cr & \Rightarrow 3x = 10x - 10{\text{SP}} \cr & \Rightarrow 7x = 10{\text{SP}} \cr & \Rightarrow {\text{SP}} = \frac{7}{{10}}x \cr & {\text{If}}\,{\text{SP}} = 140\,{\text{more}}\, = \frac{7}{{10}}x + 140 \cr & {\text{the}}\,{\text{profit}} = 40\% \cr & \Rightarrow \frac{{40}}{{100}} = \frac{{\frac{7}{{10}}x + 140 - x}}{x} \cr & \Rightarrow \frac{2}{5} = \frac{{1400 - 3x}}{{10x}} \cr & \Rightarrow 4x = 1400 - 3x \cr & \Rightarrow 7x = 1400 \cr & \Rightarrow x = 200 \cr & {\text{So,}}\,{\text{CP}} = {\text{Rs}}{\text{.}}\,200 \cr} $$Related Questions on Profit and Loss
A. 45 : 56
B. 45 : 51
C. 47 : 56
D. 47 : 51
A. Rs. 2600
B. Rs. 2700
C. Rs. 2800
D. Rs. 3000
A. A neither losses nor gains
B. A makes a profit of 11%
C. A makes a profit of 20%
D. B loses 20%
A. Rs. 3,750
B. Rs. 3,250
C. Rs. 2,750
D. Rs. 2,250
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