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Question

A shopkeeper allows a discount of 10% on the marked price. How much above the cost price must he mark his goods to gain 8%?

A
20%
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B
100%
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C
80%
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D
None of these
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Solution

The correct option is C 20%
let Marked price of an article be x
Discount on article =x10%ofx

=x10100x
=0.9x
Therefore, selling price of the article=0.9x
Now, Gain % =spcpcp
Put the value of gain % and sp in the above equation and calculate cp.
8100=0.9xcpcp
8cp=90x100cp
108cp=90x
cp=90x108
cp=5x6
Therefore, cost price cp marked above marked price(mp) =mpcpcp×100
Put the valus of cp and mp in the above equation
=x5x65x6×100
=x65x6
20%

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