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Estimated demand for gold-filled lockets at Sim's Bargain Jewellery and Housewares is 2,420 lockets a year. Manager has indicated that ordering cost is $45, and that the following price schedule applies, 1 to 599 lockets, $.90 each, 600 to 1,199 lockets, $80 each; and 1,200 or more, $.75 each. If holding cost is $.18 per locket on an annual basis, what will be the total annual cost for the optimal order quantity? a. $198 b. 51324.67 c $2013.75 d. $2134 e $2376.12