Question

how much percent above the cost should a shopkeeper marks his goods so that after allowing a discount of 20% on the marked price, he gains 12%

Answer 1

let cp= 100
then sp= 100+100×12%=112
bt a/q
80%=112
100%=112×100/80=140
so he should mark 140 as mark price
nd 140 is 40% above