Figure 5.3 shows the demand and supply curves in the market for milk. Currently, the market is in equilibrium. If the government imposes a $2 per gallon tax to be collected from sellers, calculate the...

Figure 5.3 shows the demand and supply curves in the market for milk.  Currently, the market is in equilibrium.  If the government imposes a $2 per gallon tax to be collected from sellers, calculate the dead weight loss associated with the tax, and explain why the dead weight loss occurs