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The equations for the demand and supply curves for a particular product are $P=10-\mathrm{.}4Q$ and $P=2+\mathrm{.}4Q$ respectively, where $P$ is price and $Q$ is quantity expressed in units of $100.$ After an excise tax is imposed on the product the supply equation is $P=3+\mathrm{.}4Q.$

The excise tax on each unit of the product is:

Multiple Choice

$1$

$2$

$3$

$4$