एक दुकानदार प्रत्येक कपड़े पर क्रय मूल्य से 50% अधिक अंकित करता है और 20% की छूट देता है। उसका लाभ प्रतिशत क्या होगा?

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?