Question no. 5

Marked price = 280
Discount = 20%
Discount in rupees = Marked price * Rate of discount / 100
= 280 * 20 /100
= 5600 /100
= 56

So, Selling Price would be 280 - 56 = 224

Assume that the Cost Price is 100
Then Rate of profit is 12% So, Selling price will be 112
So, if selling price is 112, cost price is 100
if selling price will be 224, What will be the cost price?

So C.P. = 224 * 100 / 112
= 22400 / 112
= 200
So, cost price of the article is rupees 200.