Suad Alwan, the purchasing agent for Dubai Airlines, has determined that the third plane took 18,000 hours to produce. Using an 85% learning curve and a $35-per-hour labor charge, he wants to determine the cost of the additional planes.

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

b) Cost of the fifth unit = _______ dollars (round your response to the nearest whole number)

c) Time required for the sixth unit = __________ hours (round your response to the nearest whole number)

d) Cost of the sixth unit = ___________ dollars (round your response to the nearest whole number)

e) Time required for the seventh unit = _________ hours (round your response to the nearest whole number)

f) Cost of the seventh unit = ___________ dollars (round your response to the nearest whole number)