If cost price of 21 watches is equal to selling price of 18 pieces, then what would be gain percent

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7.Profit and Loss

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If the cost price of $21$ watches is equal to the selling price of $18$ pieces, then what would be the gain percent in this transaction?

A

$6 \frac{1}{2}$

B

$7$

C

$16 \frac{2}{3}$

D

None of these

Solution

Here, $m=21, n=18$.

$\therefore \quad$ Gain $\%=\left(\frac{m-n}{n}\right) \times 100=\left(\frac{21-18}{18}\right) \times 100$

$=\left(\frac{3}{18} \times 100\right) \%=16 \frac{2}{3} \%$

Standard 13

Quantitative Aptitude

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