At a sales volume of 36,500 units, Thoma Corporation's sales commissions (a cost that is variable with respect to sales volume) total $613,200.
To the nearest whole dollar, what should be the total sales commissions at a sales volume of 35,500 units? (Assume that this sales volume is within the relevant range.) (Do not round intermediate calculations.)
a) $613,200
b) $630,473
c) $607,920
d) $596,400