Jane marked a dining set at 20% above cost and allowed a discount of 10% while selling to Jessica. Jessica in turn marked it at 25% above her cost price and allowed a discount of x%, making a profit of 15% (which is Rs. 25,650) while selling it to Jonathan. Find the value of x.

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?