At a Sales Volume of 20,000 Units, Choice Corporation's Sales

Multiple Choice

At a sales volume of 20,000 units, Choice Corporation's sales commissions (a cost that is variable with respect to sales volume) total $132,000.To the nearest whole cent, what should be the average sales commission per unit at a sales volume of 18,500 units? (Assume that this sales volume is within the relevant range.)

A) $6.60
B) $6.87
C) $7.17
D) $7.14