12. Table 7.2 contains long-run cost data for three different firms. Is each of these firms experiencing economies, diseconomies or constant returns to scale? Table 7.2 Plant 1 Plant 2 Plant 3 Q TC Q TC Q TC 100 5.000 1000 5000 10.000 10.000 200 5000 2000 10,000 20.000 22.000 300 5,000 3000 15,000 30.000 36.000 400 5.000 4000 20,000 40.000 $6.000 500 5,000 5000 25.000 50.000 75.000 600 5.000 6000 30.000 60.000 96 000 Plant 1 Plant 2: Plant 3