1. The Purchased cost of a shell-and-tube heat exchanger (floating head and carbon-steel tubes) with 100ft2 of heating surface was $3000 in 1980 . What will be the purchased cost of similar heat exchanger with 200ft2 of heating surface in 1980 if the purchased-cost-capacity exponent is 0.60 for surface area ranging from 100 to 400ft2 ? If the purchased-cost-capacity exponent for this type of exchanger is 0.81 for surface areas ranging from 400 to 2000ft2, what will be the purchased cost of a heat exchanger with 1000ft2 of heating surface in 1985? 2v 2Ch.G