X sells two articles for Rs. 4,000 each with no loss and no gain in the overall transaction. If one article was sold at a gain of 25%, then the other article was sold at a loss of:

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?