3. The Simcoe School Board has three invoices from Johnston Transport, all with terms 2/ 10, 1/20, n/60. Invoice 277, dated October 22, is for $14,200; Invoice 327, dated November 2, is for $8600; and Invoice 341, dated November 3, is for $11,500. What total payment to Johnston on November 12 will settle all three invoices