Prakash sold two tables for Rs. 2,484 each. On one he gained 8% and on the other he lost 8%. What is his total profit or loss percentage in the entire 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?