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Question

After allowing a discount of 20% on the marked price of a lamp, a trader loses 10%. By what percentage is the marked price above the cost price?

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Solution

Let the CP of the lamp be Rs. 100.Loss=10% of CP=Rs. 10So, SP=CP-Loss=Rs. 100-Rs. 10=Rs. 90The trader allows a discount of 20%. This means that when the MP is Rs. 100, the SP will be Rs. 80.Now,If Rs. 80 is the SP, the MP=Rs. 100If Re. 1 is the SP, the M.P=Rs. 10080If Rs. 90 is the SP, the MP=Rs. 10080×90=Rs. 112.50Hence, the trader marks his goods at 12.5% above the cost price.

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