Jefferson Products offers the following all-units quantity discount schedule for its 4-feet-by-8- feet sheets of quality plywood.

Order Size Price

19 sheets $25

1049 sheets $23

5099 sheets $21

100 sheets or more $18

Washington Home Furnishings orders plywood from Jefferson Products. The firm has an ordering cost of $50, an annual inventory holding cost percentage of 20%, and an annual demand of 250 sheets. What should the order size be every time that an order is placed?