A company uses the model 60022 – 23 R(x) = 5000 to relate its revenue, R, in thousands of dollars, to the amount of money, a, in thousands of dollars, it spends on advertising. Find the point of diminishing returns for this model. TIP Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172 Enter DNE for Does Not Exist, oo for Infinity

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A: answer is in next step. please give a like !!

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A: NOTE: Refresh your page if you can't see any equations. . take t=66 years

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