What one amount must be paid on July 4 to settle invoices dated June 20 for $150, June 24 for $236, and June 30 for $370, all with terms 1.5/10, n30? 4. MARKS Best Buy purchased a treadmill for $1,500 less 35% and 25%. The treadmill was then marked up by 200% of cost. Overhead expenses are 35% of cost. In a clearance sale, Best Buy offered the treadmill at 50% off. Determine each of the following: 8 MARKS 5. a. The net cost of the treadmill b. The amount of the markup. c. The overhead expenses per treadmill. d. The regular selling price. e. The sale price and the amount of mar