PLANT MANAGEMENT Alicia, the manager of a plant, determines that when $x\%$ of the plant's capacity is being used, the total cost of operation is $C$ hundred dollars, where

$C(x)=\frac{8x^2-636x-320}{x^2-68x-960}$

The company has a policy of rotating maintenance in an attempt to ensure that approximately $80\%$ of capacity is always in use. What cost should Alicia expect when the plant is operating at this ideal capacity?