Question 64

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:

Solution

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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