Exercise 12-18 (Algo) Special promotion-effects of a 1-cent sale LO 8, 9 The management of Rocko's Pizzeria is considering a special promotion for the last two weeks of May, which is normally a relatively low-demand period. The special promotion would involve selling two medium pizzas for the price of one, plus 1 cent. The medium pizza normally sells for $12.99 and has variable expenses of $2.6. Expected sales volume without the special promotion is 425 medium pizzas per week. Required: a. Calculate the total contribution margin generated by the normal volume of medium pizzas in a week. (Do not round intermediate calculations.) Contribution margin b. Calculate the total number of medium pizzas that would have to be sold during the 1-cent sale to generate the same amount of contribution margin that results from the normal volume. (Do not round intermediate calculations.) Total number of pizzas