Varun bought a curtain cloth from a wholesaler at a 20% discount on the marked price. He then marked the cloth at 20% higher than the original marked price and allowed a 10% discount on this new price. What is his percentage profit?

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?