The cost prices of two articles A and B are in the ratio 5 : 4. While selling these articles, the shopkeeper gains a profit of 10% on article A and 20% on article B. If the difference in their selling prices is Rs. 560, find the sum of the cost prices of articles A and B (in Rs.).

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?