A shopkeeper marks an article at such a price that after giving a discount of 12.5% on the marked price, he still earns a profit of 15%. If the cost price of the article is Rs. 385, then what is the sum of the marked price and the selling price (in Rs.) of the article?

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?