How is that calculated?

0 man! I- I 30mm 1\" Quantity Assume that the market in the graph above is at an initial equilibrium price of $10 and an equilibrium quantity of 500 units. lfthe government decides to add a $4 perfunit tax on this good. it will be able to collect the following amount of tax revenue: 0 $l,600 0 $1,200 0 $2,000 0 0