modern artifacts can produce keepsakes that will be sold for $90 each. Nondepreciation fixed costs are $1,100 per year and variable costs are $65 per unit. The initial investment of $4,300 will be depreciated straight-line over its useful life of 5 years to a final value of, and the discount rate is 10%.

a) what is the degree of operating leverage of Modern artifacts when sales are $7740?

b) What is the degree of operating leverage when sales are $13,500?