Steeltopia, a manufacturer of steel tubes, purchased raw materials from Premier Controls Ltd. and received an invoice for $20,500 dated February 29, 2020 with the following terms: 2/10, n/45. What amount does Steeltopia have to pay to settle the invoice if paid on the following dates of 2020:

a. March 10?

b. March 11?

c. April 14?

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