Suad Alwan, the purchasing agent for Dubai Airlines, has determined that the second plane took 20,000 hours to produce. Using an 75% learning curve and a $35-per-hour labor charge, he wants to determine the cost of the four additional planes. Time required for the fourth unit =15,000 hours (round your response to the nearest whole number). Part 3 Cost of the fourth unit = 525000 dollars (round your response to the nearest whole number). Part 4

Time required for the fifth unit =