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The demand for disposable teaspoons in a cafeteria is

$1000$

$$per week. Holding them in inventory costs

$10$

$\%$

$$per year

$(52$

$$weeks per year

$)$

$$over the unit value which is $

$5$

$.$

$$Currently the purchasing manager orders

$4000$

$$units every

$4$

$$weeks$.$ If the supplier offers a discount of $

$0\mathrm{.}20$

$$per teaspoon.

How many teaspoons would he advance an order to take advantage of the discount?