Month Units Sold otal Cost Month Units Sold Total Cost 321,000 $%158,500 2 166,000 102,250 206,600 101,000 202,500 113,000 266,000 206,000 291,000 191,000 359,000 271,000 75,800 151,000 95,000 101,000 $270,736 152,750 64,000 131,625 95,000 80,650 9 10 4 5 6 12 3. Predict future total costs when sales volume is (a) 388,000 units and (b) 428,000 units. Predictions Sales (units) 388,000 428,000 Total costs 0