Answer:
combined degree: 3,5385
Step-by-step explanation:
degree of operating leverage:

contribution: Q (sales - variable cost)
150,000 x (30 - 7) = 150,000 x 23 = 3,450,000
EBT = contribution - fixed cost - interest expense
3,450,000 - 2,050,000 - 425,000 = 975,000


combined degree: 3,5385