यदि विक्रय मूल्य को दोगुना कर दिया जाए, तो लाभ तीन गुना हो जाता है। लाभ प्रतिशत ज्ञात कीजिए।

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?