Maria has a $390 gift certificate at a spa that she can use on massages or manicures. A massage costs $130 and a manicure costs $39. a. Graph Maria's budget constraint. Let X= massages. Let Y = manicures. b. Suppose Maria decides to split her gift certificate with a friend and transfers half of the value of her gift certificate to her. Graph Maria's new budget constraint. c. After giving away half of her gift certificate, suppose the price of a massage increases by 30 percent before Maria can use her gift certificate. Graph Maria's new budget constraint