Question

By selling a book for ₹ 18 the shopkeeper loses 10%. At what price should he sell it to gain 10%.​

Answer 1

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here Sp = 18

loss% = 10

cp= 100/(100-10) × 18

cp = 100/90 × 18

= 20

now to make profit of 10% sp should be

sp = (100+10)/100×cp

sp=110/100×20

sp=22

so he should sell it at a price of 22