Fabrex Fabrication received an invoice in the amount of $22,540.00 dated September 28, 2021 with terms 5/10, 2/20, n/60.

a) How much must be paid on October 6, 2021 to pay the invoice in full? (3 marks)

b) If a partial payment of $11,000 was made on October 12, determine the outstanding balance remaining after the payment was received. (4 marks)