Answer:
$8
b
Explanation:
Consumer surplus is the difference between the willingness to pay of a consumer and the price of the good.
Consumer surplus = willingness to pay – price of the good
Consumer surplus = willingness to pay per scarf - price per scarf
willingness to pay per scarf = $200 / 10 = $20
price per scarf = 12
$20 - $12 = $8
A rational consumer would stop purchasing at the point where marginal benefit is less than marginal cost .
Because he has 10 friends he wants to give the gift to, buying an extra scarf would yield no benefit to him