The graph shows the profit P (in dollars) from selling units of an item. Use the graph to determine which is greater, the change in profit when the production level changes from 400 to 401 units or the change in profit when the production level changes from 900 to 901 units. Explain your reasoning

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Profit (in dollars) 10,000 P 9,000- 8,000 7,000 6,000 5,000- 4,000- 3,000 2,000- 1,000- + + 100 200 300 400 500 600 700 800 900 1000 Number of units X