PLEASE HELP :')

Suad Alwan, the purchasing agent for Dubai Airlines, has determined that the second plane took 16,000 hours to produce. Using an 75% learning curve and a $40-per-hour labor charge, he wants to determine the cost of the four additional planes.

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

b. Cost of the fourth unit = ?

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

d. Cost of the fifth unit = ?

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

f. Cost of the sixth unit = ?