4) A pizza chain recently offered the following special promotion: "Buy one pizza at full price and get your next three pizzas for just $5 each!" Assume that the price of a pizza is $10, your daily income is $40, and the price of all other goods $1 per unit. a. Draw budget constraints for pizza and all other goods that reflect your situations both before and during the special promotion. (Put the quantity of pizzas on the horizontal axis.) Indicate the horizontal and vertical intercepts and the slope of the budget constraint. b. How is this special offer likely to alter your buying behavior? c. How might your answer to (b) depend on the shape of your indifference curves