किसी वस्तु को Rs. 800 में बेचने पर अर्जित लाभ, उसे Rs. 275 में बेचने पर हुई हानि का 20 गुना है। यदि 25% का लाभ कमाना हो, तो वस्तु को किस मूल्य पर बेचा जाना चाहिए?

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?