A firm earns a revenue of Rs 50 when the market price of a good is Rs 10. The market price increase to Rs 15 and the firm now earns a revenue of Rs 150. What is the price elasticity of the firm's supply curve?
At Price, P1 = Rs 10
Total Revenue, TR1 = P1 x Q1 = 50
= TR1/P1 = Q1
= 50/10 = Q1
= Q1 = 5units
At Price, = Rs 15
Total Revenue, TR2 = P2 x Q2 =150
= Q2 = TR2/P2
= Q2 = 150/15
= Q2 = 10 units
Elasticity of supply,es = ΔQ/ΔP x P/Q
ΔQ = Q2 - Q1 = 10 - 5 = 5
P = P1 - P2 = 15 - 10 = 5
es = 5/5 x 10/5
es = 2.