Hi! I really need help on this! Thank you in advance!

GUIDELINES:

A manager has just received a revised price schedule from a vendor. What order quantity should the manager use in order to minimize total costs? Annual Demand is 120 units, ordering cost is $8, and annual carrying cost is $1 per unit. Quantity Unit Price 1 to 39 units $14 40 to 59 units $13 60 to 89 units $12 90 or more units $11 For all the problems, you have to show your complete and accurate work to receive full scores. If you only provide the final answers without showing your computations, even your answer is correct, you will not be assigned a full score (or if your answer is wrong, you will miss the opportunity of receiving any partial credit)