Question

If the cost price of 10 greeting cards is equal to the selling price of 8 greeting cards, find the gain or loss percent.

Answer 1

let the cp for 1 pen be re.1
then cp of 10 pen is rs 10
now sp of 8 pen is rs. 10
sp of 1 pen is 10/8
sp of 10 pen = (10/8)*10 = rs.
12.5
profit = 12.5-10 = rs. 2.50
%profit = 2.50/10 *100 = 25%