Question : The ratio of the selling price to the cost price of a computer is 7 : 5. What is the profit percentage?
Option 1: 60%
Option 2: 10%
Option 3: 40%
Option 4: 20%
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Correct Answer: 40%
Solution : Given, The ratio of selling price to cost piece = 7 : 5 We know, Profit percentage = $\frac{\text{Profit}}{\text{cost price}} × 100$ Let the selling price and cost price be $7x$ and $5x$ respectively Profit = $7x - 5x$ ⇒ Profit = $2x$ So, the profit percentage $=\frac{2x}{5x} × 100= 40$% Hence, the correct answer is 40%.
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