by selling a book for 516 a bookseller gains 20% for how much should he sell it to gain 30%?
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Answer:
cp of book=sp×100/100+gain%
=516×100/100+20
=₹430
sp at gain of 30%=cp×100+gain %/100
=430×100+30/100
=₹559
sp of book to gain 30%=₹559
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