Suad Alwan, the purchasing agent for Dubai Airlines, has determined that the second plane took 20,000 hours to produce. Using an 85% learning curve and a $30-per-hour labor charge, he wants to determine the cost of the four additional planes.

Time required for the fourth unit = 17000 hours (round your response to the nearest whole number).

Cost of the fourth unit = 510,000 dollars (round your response to the nearest whole number).

Time required for the fifth unit = ? hours (round your response to the nearest whole number).