Salter Inc.'s unit selling price is $51, the unit variable costs are $32, fixed costs are $115,315, and current sales are 9,505 units. How much will operating income change if sales increase by 5,780 units?

Select the correct answer.

a. $779,535 decrease

b. $109,820 increase

c. $184,960 increase

d. $294,780 increase