问题描述：
79.
Justin purchased a Polar Express train set from Lionel Trains.He paid $240 for the set and received consumer surplus of $125.What was Justin's willingness to pay for the train set?
A)
$115
B)
$240
C)
$250
D)
$365
84.
Tavist allergy pills sell for $25 a box.Steve,Brian,and Toby are willing to pay $33,$27,and $19,respectively,for a box of Tavist.What is the total consumer surplus for Steve,Brian,and Toby?
A)
$16
B)
$10
C)
$4
D)
$60
Justin purchased a Polar Express train set from Lionel Trains.He paid $240 for the set and received consumer surplus of $125.What was Justin's willingness to pay for the train set?
A)
$115
B)
$240
C)
$250
D)
$365
84.
Tavist allergy pills sell for $25 a box.Steve,Brian,and Toby are willing to pay $33,$27,and $19,respectively,for a box of Tavist.What is the total consumer surplus for Steve,Brian,and Toby?
A)
$16
B)
$10
C)
$4
D)
$60
问题解答：
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