Consumer surplus when price is 22
CS = 1/2(28 - 22)(40)
= 120
Consumer surplus when price is 16
CS = 1/2(28 -16)(80)
= 480
Change in consumer surplus = 480 - 120
= 360
Thus consumer surplus increases by 360
The increase in consumer surplus can also be directly computed as
Incease in CS = (22 -16)(40)+ 1/2(22-16)(80 -40)
= 240 + 120
= 360
So b is correct option
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