Modern Artifacts can produce keepsakes that will be sold for $82 each. Nondepreciation fixed costs are $1,200 per year, and variable costs are $58 per unit. The initial investment of $2,900 will be depreciated straight-line over its useful life of five years to a final value of zero, and the discount rate is 12%. a. What is the degree of operating leverage of Modern Artifacts when sales are $6,560? (Round your answer to 1 decimal place.) b. What is the degree of operating leverage when sales are $11,480?