A trader allows a discount of 25% on a trolley bag whose marked price is Rs. 1248 and still makes a profit of 20%. What is the cost price of the trolley bag?

A company considers hiring an extra machine for $150 per day to produce additional units. If the additional throughput contribution generated from producing these units on the machine is $390, by how much will total profit increase?

If the cost price of an article is 85 times its selling price, what is the loss percentage?