A ready-made garments shop in Delhi allows 20 percent discount on its garments and still makes a profit of 20 percent. Find the marked price of a dress which is bought by the shopkeeper for Rs. 400.
C.P. of the dress = Rs. 400
Profit = 20100×Rs.400=Rs.80
S.P. = C.P. + Profit
= Rs. 400+ Rs.80
= Rs. 480
Let M.P. of the dress = Rs. 100
Discount@ 20% = 20100×Rs.100=Rs.20
S.P. of the dress = M.P. - Discount
= Rs. 100 - Rs. 20
= Rs. 80
If S.P. of the dress is Rs. 80; then M.P. = Rs.100
If S.P. of the dress is Rs. 1 then M.P. = Rs 10080
If S.P. of the dress is Rs. 480 then M.P. = Rs 10080
= Rs. 10080×480
= Rs.100×6=600
∴ M.P. of the dress = Rs. 600