A sold his pen at a profit of ₹13. He calculated the profit percentage on selling price and found it to be 20%. The cost price (in ₹) of the pen is:
A sold his pen at a profit of ₹13. He calculated the profit percentage on selling price and found it to be 20%.
Let's assume the cost price of the pen is ₹'y'.
selling price = (y+13)
$$20\%=\frac{13}{(y+13)}$$
$$\frac{1}{5}=\frac{13}{(y+13)}$$
(y+13) = 65
cost price of the pen = y = 65-13 = ₹52
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