A firm with 6 machines must decide where to sell each machine, North America (NA) or Asia, to make the largest profit. The following table shows the firm's average benefit in each market. For example, if it sells 3 machines in NA, it earns $18 million per machine on average. Where would the firm sell each machine?

Machin Average Marginal Average Marginal es sold Total Benefit Benefit Machine Total Benefit Benefit in Benefit (per (per (per (per North machine machine) s sold in Benefit Americ Asia machine) machine)| a C $0 $0 1 $22 m $11 m 2 $20 m 2 $10 m 3 $18 m $ 9 m $16 m 4 $ 8 m $14 m $7 m $12 m $6 m