Three invoices for the amounts of $35,400, $25,000, and $41,350 were received on July 9, 2014, August 8, 2014, and August 31, 2014, respectively. If the payment terms are 3/7, 2/30, n/60, calculate the amount that must be paid on September 7, 2014 to settle all three invoices. Round to the nearest cent