In the market for a good the quantity supplied (QS) and the quantity demanded (QD)

In the market for a good the quantity supplied (QS) and the quantity demanded (QD) are given by QS = P – 30 and QD = 240 – 2P where P = price in dollars.
A change in the tax on the good makes QS = P – 36.
How will the change affect equilibrium price?
A It will fall by $2.
B It will fall by $6.
C It will rise by $2.
D It will rise by $6