A manager just received a new price list from a supplier. It will now cost $1.00 a box for order quantities of 801 or more boxes, $1.10 a box for 200 to 800 boxes, and $1.20 a box for smaller...

A manager just received a new price list from a supplier. It will now cost $1.00 a box for order
quantities of 801 or more boxes, $1.10 a box for 200 to 800 boxes, and $1.20 a box for smaller
quantities. Ordering cost is $80 per order and carrying costs are $10 per box a year. The firm uses
3,600 boxes a year. The manager has suggested a “round number” order size of 800 boxes. The
manager’s rationale is that with a U-shaped cost curve that is fairly flat at its minimum, the difference in total annual cost between 800 and 801 units would be small anyway. How would you reply
to the manager’s suggestion? What order size would you recommend?