Average Cost

Jester Sports manufactures tennis rackets. The total cost of producing

xrackets per hour is given by

()=C(x)=0.59 2+x2+5.9x+ 420.

The average cost per racket at production level

xrackets per hour is()=()C(x)=C(x)x.

Use differential approximations to estimate the change in average cost per racket if the production is increased from 20 per hour to 23 per hour. Round to the nearest cent.

$ per racket

NOTE: Your answer may be negative.