The equilibrium price and quantity under different circumstances

The demand function for a good is QD = 30 − P, and the supply function is Qs = 4P.
(a) Find the equilibrium price and quantity for the good.
(b) Due to a natural disaster, the supply of the good decreased by half. What are the new equilibrium price and quantity?
(c) When there is no natural disaster, the demand for the good is increased to QD = 30 - 0.8P. What are the new equilibrium price and quantity?

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