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Lemons were bought at\( Rs.\;60\) a dozen and sold at the rate of \(Rs.\;40\) per \(10\). Find the gain or loss per cent.
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Question

Lemons were bought at\( Rs.\;60\) a dozen and sold at the rate of \(Rs.\;40\) per \(10\). Find the gain or loss per cent.

Answer

Since, cost price of \(12\) lemon is \(Rs.\;60\)
[\(\because\) \(1\;\text{dozen lemon}=12\text{ lemon}\)]
So, cost price of \(1\) lemon is \(\frac{60}{12}\)
\(=Rs.\;5\)
Since, selling price of \(10\) lemon is \(Rs.\;40\)
So, selling price of \(1\) lemon is \(\frac{40}{10}\)
\(=Rs.\;4\)
\(\%\text{Loss}=\frac{\text{Cost price}-\text{Selling price}}{\text{Cost price}}\times 100\)
\(=\frac{5-4}{5}\times 100\)
\(=\frac{1}{5}\times 100\)
\(=20\%\)
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