At a sales volume of 32,500 units, Thoma Corporation's sales commissions (a cost that is variable with respect to sales volume) total $526,500. To the nearest whole dollar, what should be the total sales commissions at a sales volume of 31,200 units? (Assume that this sales volume is within the relevant range.) (Do not round intermediate calculations.) $548,438 $526,500 $516,960 $505,440