Betty DeRose, Inc. manufactures a single product that it sells for $45 per unit. Provided below is information about this product for the past six months: Month March April May June July August Units Sold 5,390 7,040 6,670 8,610 5,540 7,960 Total Cost Incurred $173,190 $211,360 $204,220 $250,470 $175,930 $233,040 Calculate the number of units that would need to be sold in September in order for the degree of operating leverage for September to be equal to 1.40.