Problem E.14 Question Help Suad Alwan, the purchasing agent for Dubai Airlines, has determined that the second plane took 20,000 hours to produce. Using an 80% 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 = hours (round your response to the nearest whole number). Enter your answer in the answer box and then click Check Answer. parts remaining Clear All Check