An article, whose marked price is ₹100, was bought at a discount of 10%. At what price should it be sold to fetch a profit of 25%?

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?