The total cost is y, then

y =(X * 1 * 2+200/X * 1 * 2)* 400+200 * 80+200/X * 2 * 248

=800(X+324/X)+ 16000

This formula is greater than or equal to the average inequality.

Symbols under 800* (324x/x)+ 16000

If and only if x= 18, the equal sign holds, and x takes this value, it has practical significance.

Minimum value 44800