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In order that there may be a profit of 15% after allowing a discount of 10% on the marked price, The marked price of an book has to be increased by %? 
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1 Answer

Mp= Rs x

Sp= 90x/100= 9x/10

Mp= 9x/10*100/115=18x/23

Mp has increased by

(x-18x/23)/(18x/23)*100

=27.7%
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