19. The A-1 Corporation supplies airplane manufacturers with preformed sheet metal panels that are used on the exterior of aircraft. Manufacturing these panels requires only five sheet metal–forming machines, which cost $300 each, and workers. These workers can be hired on an as-needed basis in the labor market at $7,000 each. Given the simplicity of the manufacturing process, the preformed sheet metal panel market is highly competitive. Therefore, the market price for one of A-1’s panels is $50. Based on the production data in the accompanying table, how many workers should A-1 hire to maximize its profits?

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Sheet Metal-Forming Machines 5 5 5 5 5555 Workers Number of Panels Produced 0 0 1 600 -23456 1,000 1,290 1,480 1,600 1,680