At a sales volume of 37,500 units, Thoma Corporation's sales commissions (a cost that is variable with respect to sales volume) total $611,250. To the nearest whole dollar, what should be the total sales commissions at a sales volume of 36,000 units? (Assume that this sales volume is within the relevant range.) (Do not round intermediate calculations.) A.$586,800 B. $598,320 C. $636,719 D. $611,250