Consider the following table of long-run total costs for three different firms:

Quantity 1 2 3 4 5 6 7

Firm A 60 70 80 90 100 110 120

Firm B 11 24 39 56 75 96 119

Firm C 21 34 49 66 85 106 129

Indicate whether each firm experiences economies of scale or diseconomies of scale. (Note: If a firm experiences economies of scale in one region and diseconomies of scale in another, make sure to select both columns.)

Firm A

Firm B

Firm C