Spice Inc.'s unit selling price is $60, the unit variable costs are $35, fixed costs are $125,000

Question:

Spice Inc.'s unit selling price is $60, the unit variable costs are $35, fixed costs are $125,000 and current sales are 10,000 units. How much will operating income change is sales increase by 8,000 units?
a. $150,000 decrease
b. $175,000 increase
c. $200,000 increase
d. $150,000 increase