Option 3: 1000 -> Using the price elasticity of supply formula: Es = (% change in quantity) / (% change in price). Given Es = 2, initial price = Rs 10, new price = Rs 30, and initial quantity = 200 units. The % change in price = (30-10)/10 = 200%. Since Es = 2, the % change in quantity = 2 × 200% = 400%. Therefore, the new quantity = 200 + (400% of 200) = 200 + 800 = 1000 units. -> correct