The ordering and transportation costCper unit for the components used in manufacturing a product is

C= (180,000+2x²)/x, x1

whereCis measured in dollars andxis the order size. Find the rate of change ofCwith respect toxat each value. (Round your answers to three decimal places.) (a)

x=250

C'(250) =

(b)

x=300

C'(300) =

(c)

x=350

C'(350) =