A retailer buys a computer for Rs. 30,000. He spends some amount on overhead expenses and then sells the computer for Rs. 43,750, making a profit of 25% on the total cost. The overhead expenses are what percentage of the initial cost price?

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?