The figure represents a demand function with a fixed market price denoted by its corresponding point on the demand graph. Calculate the value of and write a sentence of interpretation for each of the following. q billion cards 14 1 12 10 8 6 D (1.5, 4.7) 4 2 Area = 6.03 + p dollars per card 4 5 Paras 0 1 2 3 (a) Consumer expenditure $ x billion billion cards at $ per card, is The consumer expenditure, or the total amount spent on cards to purchase $ X billion