A trader sells two items at Rs. 400 each. On one item he gains 15% and on the other he loses 15%. What is the net loss amount (in Rs.)?

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?