ack and Tack has been buying a chemical water conditioner for its bait $($to help keep its aitfish alive$)$ in an optimal fashion using EOQ analysis. The supplier has now offered Jack Tack a discount of $$0\mathrm{.}50$ off all units if the firm will make its purchases monthly. Current data for the problem are: D $=720$ units per year; Co $=$ $$6\mathrm{.}00,$ C$=20\%$ per year; P $=25.$

a$.$ What is the EOQ at the current behavior?

b$.$ What is the annual total cost, including product cost, of continuing their

current behavior?

Should they accept the supplier's offer? Why?