Solve.
Retail Store Profit The manager of a retail store has figured that her monthly profit P(in thousands of dollars) is determined by her monthly advertising expense x (in tens of thousands of dollars) according to the formula
P = x3 − 20x2 + 100x for 0 ≤ x ≤ 4.
For what value of x does she get $147,000 in profit?
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