Answer:
Individual answer to parts are given :
a. At equilibrium,
Qs=Qd
4P-80=100-2P
6P=180
P*=30
Q*= 4*30-80= 40
Equilibrium price=$30
Equilibrium Quantity= 40
b. Consumer surplus=0.5(50-30)(40)= $400
Producer surplus=0.5(30-20)(40)= $200
Total surplus= $400+$200=$600
c. Elasticity of demand at P=30 & Q=40, Ed= -2*(30/40)= -1.5
Elasticity of supply at P=30 & Q=40, Es= 4*(30/40)= 3
Demand is More inelastic than supply. So consumers will have more burden in case of prohibition of vegetables.