Trey, Inc. is studying marketing cost and sales volume, and has generated the following information by use of a scatter diagram and a least-squares regression analysis: Scatter Diagram Regression Analysis Variable cost per unit sold Total monthly fixed cost $ 6.20 $46,000 $ 6.60 $41,500 Trey is now preparing an estimate for monthly sales of 19,000 units. On the basis of the data presented, compute the most accurate sales forecast possible. Multiple Choice $159,300. $163,800. $166,900. $171,400. None of the answers is correct