Jill's Job Shop buys two parts $($Tegdiws and Widgets$)$ for use in its production system from two different suppliers. The parts are needed throughout the entire $52-$week year. Tegdiws are used at a relatively constant rate and are ordered whenever the remaining quantity drops to the reorder level. Widgets are ordered from a supplier who stops by every four weeks. Data for both products are as follows:

ITEM TEGDIW WIDGET

Annual demand $10,0005,000$

Holding cost $(\%$ of item cost$)10\%20\%$

Setup or order cost $ $100\mathrm{.}00$ $ $20\mathrm{.}00$

Lead time $4$ weeks $4$ weeks

Safety stock $50$ units $5$ units

Item cost $ $15$ $ $10$

What is the inventory control system for Tegdiws?