question $6$ got cut off, here is the full question:

$6.$ Refer to the data in requirement $5.$

a$.$ If the new plant is built, how many balls will have to be sold next year to earn the same net operating income, $$107,600,$ as last year?

b$.$ Assume the new plant is built and that next year the company manufactures and sells $34,000$ balls $($the same number as sold last year$).$ Prepare a contribution format income statement and compute the degree of operating leverage.