My Kitchen Delights $($MKD$)$ is considering two new suppliers for the jars used in the production process. The quality at both suppliers is equal. Assume that the annual holding cost is $30$ percent of the unit price. Monthly demand averages $20,500$ jars. Ordering cost with these two suppliers is $$31$ per order. The price lists for the suppliers are as follows: Supplier A: quantity $1-2499$; unit price $$3\mathrm{.}10$ quantity $2500-3499$; unit price $$3\mathrm{.}00$ quantity $3500-4999$; unit price $$2\mathrm{.}90$ quantity $5000$ or more; unit price $$2\mathrm{.}80$ Supplier B: quantity $1-1999$; unit price $$3\mathrm{.}20$ quantity $2000-2999$; unit price $$2\mathrm{.}85$ quantity $3000-3999$; unit price $$2\mathrm{.}55$ quantity $4000-4999$; unit price $$2\mathrm{.}45$ quantity $5000$ or more; unit price $$2\mathrm{.}30($Round your answers to $1$ decimal place, e$.$g$.,4500\mathrm{.}6.)($a$)$ Determine the optimal order quantity when using Supplier A$.\_\_\_\_\_$ jars $($b$)$ Determine the optimal order quantity when using Supplier B$.\_\_\_\_\_$ jars $($c$1)$ Given MKD$\text{'}$s lack of space, which supplier do you recommend be used? Supplier $\_\_\_\_\_\_\_$