Previous Question Question 39 of 45 Next Question The chart below shows consumers' willingness to pay for cups of coffee. Cups John Anton Julie Sarah 1st cup $15 $20 $10 $6 2nd cup $12 $16 $8 $5 3rd cup $9 $12 $6 $3 4th cup $6 $8 $5 $2 5th cup $3 $5 $2 $1 6th cup $0 $0 $0 $0 If these are the only four buyers in the market, then the market quantity demanded at a price of $4 is: 12 cups 15 cups 20 cups 22 cups