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Question

How much percent above the cost price should a shopkeeper mark his goods so that after allowing a discount of 20% on the marked price, he still has a gain of 10%?

A
10%
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B
25.5%
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C
30%
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D
37.5%
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Solution

The correct option is D 37.5%
Let the cost price of the good be Rs. 100.
Selling price when profit is 10%=(100+10100×100)=Rs. 110

Let the marked price is Rs. x.
After giving a discount of 20% , the new selling price =x(20x100)
The shopkeeper gains 10% after giving the discount. Thus,
[x(20x100)]=110
4x5=110
x=110×54
x=Rs. 137.5

So. this implies that the marked price of the good is equal to Rs. 137.5.
Hence, the required increase Rs. 137.5Rs. 100=Rs. 37.5.
Or we can say that the required marked price should be Rs. 37.5% more than that of the cost price.

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