The diagram shows the impact of a government imposing a unit tax on a demerit good. S is the supply curve before the tax and ${S_1}$ is the supply curve after the tax.
What is the after-tax revenue of the firm producing the demerit good?

$\$ 100$
2 )
$\$ 200$
3 )
$\$ 300$
4 )
$\$ 500$
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