A plant manufactures heat exchangers at rate of N units per day. Daily fixed charge is Rs.5000/- and variable cost per heat exchanger is 1000+0.3(N)°³. The selling price per heat exchanger is...

Extracted text: A plant manufactures heat exchangers at rate of N units per day. Daily fixed charge is Rs.5000/- and variable cost per heat exchanger is 1000+0.3(N)°³. The selling price per heat exchanger is Rs.2000/-. The number of heat exchangers to maximize the daily profit is a) 5.3×10" b) 4.3×10" c) 3.3×10'1 d) 2.3×10"