A trader sold a refrigerator for ₹ 15,600 at a 20% profit. At what price should the refrigerator have been sold to break even (no profit and no loss)?

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?