A shopkeeper marked the selling price of an article at 20% above the cost price. At the time of selling, he allows a certain discount and suffers a loss 20%. He allowed a discount of:
25%
20%
66.66%
35%
33.33%
Solution
Let the cost price of an article be Rs100, then
Marked price = 100 $\times \frac{120}{100}=Rs120$
SP = $100~\times \frac{80}{100}=Rs80$
Discount = 120 - 80 = 40
Discount% = $\frac{40}{120}~\times 100=33.33$%