A man sold two tables for ₹ 720 each. On one he gained 20% and on the other he lost 20%. Find his total loss or gain in this transaction.

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?