Assume that there are four consumers A, B, C, and D, and the prices that each of them is willing to pay for a glass of lemonade is, respectively, $1.50, $1.20, $1.00, and $0.90. If the actual price of lemonade is $1.00 per glass, then consumer surplus in this market will be:
a. $0.80
b. $0.70
c. $0.50
e. $0.60
