A shopkeeper allows his customers 10% off on the marked price of goods and still gets a profit of 25%. What is the actual cost to him of an article marked Rs. 250?
Marked price = Rs. 250
Discount allowed = 10%
∴ Selling price =M.P×(100−Discount%)100
=250×(100−10)100=250×90100=Rs.225
Gain =25%
∴ Cost price =S.P×100100+gain%
=225×100100+25=Rs.225×100125=Rs.180