Question

If cp of 36 books is equal to selling price of 30 books, then teh gain percent?

Answer 1

If X is the cp of 1 book and y is the sp of 1 book.

so cp of 36 books is 36x..

and so of 30 books is 30y

36x=30y. =>x=5y/6

Gain =selling price-cost price

36(selling price-cost price)

36(y-5y/6)

36(y/6)

gain= 6Y

gain percentage is. =(gain /cost price×100)( 6Y/30Y×100)

=100/5=20%