Elizabeth went to a furniture store and purchased a study table. She received a 20% discount on it. She would have saved Rs. 1,000 more if she had received a 25% discount. What was the marked price of the study table?

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?