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Part $1$

Suad$$ Alwan, the purchasing agent for Dubai$$ Airlines, has determined that the plane took $18000$ hours to produce. Using an $80\%$ learning curve and a $$$$30-$per$-$hour labor$$ charge, he wants to determine the cost of the four additional planes.$$

Part $2$

Time required for the fourth unit$=$

$$

enter your response here hours$($round your response to the nearest whole$$ number$).$