The consumer surplus is $12.
Consumer surplus is the difference between the willingness to pay of a consumer and the price of the good.
Consumer surplus increases when there is a decrease in the price of the good. Consumer surplus decreases when there is an increase in the price of the good.
When consumer surplus is depicted on a graph, it is the triangular area between the price of the good and the highest amount consumers are willing to pay for the good.
When consumer surplus is added to producer surplus, the result is total surplus
Consumer surplus = willingness to pay – price of the good
$22 - $10 = $12
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