a) Elastic: Price range: P < 40 (since elasticity > 1)
b) Unit elastic: Price range: 40 = P = 80 (since elasticity = 1)
c) Inelastic: Price range: P > 80 (since elasticity < 1)
Note: To calculate elasticity, you would use the formula:
Elasticity = (ΔQ / ΔP) × (P / Q)
Where ΔQ and ΔP are small changes in quantity and price, respectively.