Question

by selling a book for 516 a bookseller gains 20% for how much should he sell it to gain 30%?​

Answer 1

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