1. The following points come from a Demand Curve : (p0,Qo)=($70,30 thousand units) and (p1,Q1)=($45,55 thousand units), then the mid-point price-elasticity of demand in absolute value is: (1) 1.667 (2) 1.611 (3) 1.699 (4) 1.688 2. The following points come from a Supply Curve : (p0,Qo)=($45,45 thousand units) and (p1,Q1)=($50,55 thousand units), then the mid-point price-elasticity of supply is: (1) 1.888 (2) 1.900 (3) 1.700 (4) 1.899 3. If the price-elsticity of demand for gasoline is 0.27 in absolute value, and the price-elasticity of supply of gasoline is 2 when the price of gasoline is $3 per gallon, then a $0.20 lump-sum tax per gallon: (1) Will increase the quantity demanded in 1.81% (2) Will increase the quantity supplied in 13.4% (3) The burden of the tax will be paid mostly by the suppliers of gasoline in the market (4) The burden of the tax will be paid mostly by the buyers of gasoline in the market