Pisa$$ Pizza, a seller of frozen$$ pizza, is considering

introducing a healthier version of its pizza that will be low in

cholesterol and contain no trans fats. The firm expects that sales

of the new pizza will be $ $18$ million per year. While many of these

sales will be to new$$ customers, Pisa Pizza estimates that $33\%$

will come from customers who switch to the$$ new, healthier pizza

instead of buying the original version. a$.$ Assume customers will

spend the same amount on either version. What level of incremental

sales is associated with introducing the new$$ pizza? b$.$ Suppose

that $44\%$ of the customers who will switch from Pisa$$ Pizza's

original pizza to its healthier pizza will switch to another brand

if Pisa Pizza does not introduce a healthier pizza. What level of

incremental sales is associated with introducing the new pizza in

this$$ case?