4. In this problem, we will study how dierent types of promotions aect a consumeris budget constraint.

Suppose that a consumer has $200 to spend per month. Assume that the price of a unit of a household product is $5. For each of the following scenarios, draw the consumeris budget constraint by plotting all else on the y-axis and household products on the x-axis.

(a) (2 points) For every $100 she spends on household products she gets $10 back which she can spend on anything.

(b) (2 points) Suppose that once the consumer purchases 10 household products, each additional household product is 50% cheaper.