Answer:
 Total cost =$339,704.55
Explanation:
Annual inventory demand = quarterly demand ×  4
=  16,761  ×4 = 67044
Purchase cost
= cost per unit × annual demand
= 67044 × $5  = $335,220.00
Annual set-up cost Â
= set up cost r × no of set-up
=( 67044/ 3,58) × $120= 2242.274247
Annual holding cost
= Holding cost × average inventory
(3,588/2 )× $5  = $2242.5
Total annual inventory cost
= Â 2242.27+ $2242.5 + 335,220
= Â $339,704.55
Yes, the EOQ is correct because the annual set-up cost = Annual holding cost