Question

A man marks his goods 20%above the cost price but allows a discount of 10% find his gain%

Answer 1

m.p=20% of x
m.p=20x/100+x
m.p=120x/100
S.p=120x/100*90/100
S.p=108x/100
gain =108x-x
gain =8x/100
gain%=8x/100/x*100
gain%=8%