The Happy-Go-Lucky toy company found that the rate its revenue is changing, measured in hundreds of dollars per unit, 328 can be modeled by the function r(x) z is the number of units sold. What is the best interpretation of / r(t)dt = 5.5 ? The company's Revenue is increasing by $5.5 per unit for the first 328 units sold. The company's Revenue is decreasing by $ per unit for the first 328 units sold. The company's Revenue is decreasing by $5.5 per unit for the first 328 units sold. The company's Revenue is $5.5 for the first 328 units sold. O The company's Revenue is $550.00 for the first 328 units sold.

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