Suad Alwan, the purchasing agent for Dubai Airlines, has determined that the third 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 six additionat planes. Time required for the sixth unit = hours (round your response to the nearest whole number). Cost of the sixth unit = dollars (round your response to the nearest wholo number). Time required for the seventh unit = hours (round your response to the nearest whole number). Cost of the seventh unit = dollars (round your response to the noarest whole number). Time required for the eighth unit = hours (round your response to the nearest wholo number)