The profit earned on selling an article for Rs. 900 is equal to the loss incurred on selling it for Rs. 700. If the seller wants to earn a profit of 40%, then at what price should he sell the article?

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?