Question

how much percent above the cost price should A shopkeeper marks his goods so that after allowing a discount of 20% on the Marked price he gains 12%
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Answer 1

let c.p. = 100 Rs.

to gain 12%, s.p. = 112 Rs.

for allowing 20% discount , 80% of m.p. = s.p.

so, m.p. = 140 Rs.

so he should mark 40% above the cost price.