Answer
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Hint: Use the information that, percentage profit is equal to $\dfrac{{SP - CP}}{{CP}} \times 100$, where SP stands for selling price, CP stands for cost price.
Complete step-by-step answer:
We know that, percentage profit is equal to $\dfrac{{SP - CP}}{{CP}} \times 100$. Where SP stands for selling price, CP stands for cost price. In our question selling price and percentage profit is given to us as 900 and 20% respectively. On putting the values, we get,
$
\% {\text{ profit}} = \dfrac{{SP - CP}}{{CP}} \times 100 \\
\Rightarrow 20 = \dfrac{{900 - CP}}{{CP}} \times 100 \\
\Rightarrow \dfrac{{CP}}{5} + CP = 900 \\
\Rightarrow \dfrac{6}{5}CP = 900 \\
\Rightarrow CP = 900 \times \dfrac{5}{6} \\
\Rightarrow CP = 750 \\
$
Hence the cost price is Rs. 750 and the gain is nothing but difference of selling price and cost price which is $900 - 750 = 150$
Note: In the profit loss question, it’s always recommended to be empathetic and this as a vendor/ person’s perspective. It’ll give us a better understanding of the question for us.
Complete step-by-step answer:
We know that, percentage profit is equal to $\dfrac{{SP - CP}}{{CP}} \times 100$. Where SP stands for selling price, CP stands for cost price. In our question selling price and percentage profit is given to us as 900 and 20% respectively. On putting the values, we get,
$
\% {\text{ profit}} = \dfrac{{SP - CP}}{{CP}} \times 100 \\
\Rightarrow 20 = \dfrac{{900 - CP}}{{CP}} \times 100 \\
\Rightarrow \dfrac{{CP}}{5} + CP = 900 \\
\Rightarrow \dfrac{6}{5}CP = 900 \\
\Rightarrow CP = 900 \times \dfrac{5}{6} \\
\Rightarrow CP = 750 \\
$
Hence the cost price is Rs. 750 and the gain is nothing but difference of selling price and cost price which is $900 - 750 = 150$
Note: In the profit loss question, it’s always recommended to be empathetic and this as a vendor/ person’s perspective. It’ll give us a better understanding of the question for us.
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