Wivelsfield currently uses the economic order quantity $($EOQ$)$ to establish the optimal order quantities for their main raw material. The company has been approached by an alternative supplier who would be willing to offer the following discounts:

Order quantity Discount$/$

$0-199$ units $1\backslash \%$

$\backslash (200-499\backslash )$ units $3\backslash \%$

$\backslash (500-699\backslash )$ units $5\backslash \%$

$700$ units or more $7\backslash \%$

Information regarding current inventory costs is as follows:

Holding cost per unit per annum $\backslash (=10\backslash \%\backslash )$ of purchase price

Order costs $=\backslash$$$2$ per order

Annual demand $\backslash (=15,000\backslash )$ units

Purchase price $\backslash (=\backslash$$ $15\backslash )$

Current EOQ $=200$ units