A supply company manufactures copy machines. The unit cost ( c ) (the cost in dollars to make each copy machine) depends on the number of machines made. If ( x ) machines are made, then the unit cost is given by the function ( c(x) = 0.8x² - 208x + 32,601 ). What is the minimum unit cost? Do not round your answer.
a. $32,601
b. $41,001
c. $40,201
d. $40,801