If a discount of 15% is allowed on the marked price of an article, a customer gets 15 more articles for ₹1,700 than the number of articles he gets when no discount is allowed. The marked price of each article (in Rupees) is:

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?