Vonda and Aleiyah are shopping together at the mall for new jeans. Vonda is willing to pay $90 and A

Vonda and Aleiyah are shopping together at the mall for new jeans. Vonda is willing to pay $90 and Aleiyah is willing to pay $50 for a pair of jeans. What is the gainin total consumer surplus when the price decreases from $59 to $40?
Choose one answer.
a. $60
b. $10
c. $31
d. $29