Marge has a demand for 2-liter bottles of Diet Coke given by the demand curve P =15- 0.5Q (or Q =30-2P), where P is the price of each 2-liter bottle and Q is the quantity of bottles consumed.Suppose the price schedule for 2-liter bottles of Diet Coke at Marge's local supermarket is as follows:

• First 15 bottles are $4/bottle
• All remaining bottles are only $2/bottle

How many 2-liter bottles does Marge consume?

13

14

22

26

48

None of the above are correct.