2.Preston Milled Products currently sells a product with a variable cost per unit of $21 and a unit selling price of $40. At the present time, the firm only sells on acash basis with monthly sales of 2,800 units. The monthly interest rate is 0.5 percent. What is the switch break-even point if the firm switched to a net 30 creditpolicy? ( hint : solve for (Q' - Q) while keeping the NPV equal to 0 )