I just need help with part c and d please. I will upvote if correct

Suad Alwan, the purchasing agent for Dubai Airlines, has determined that the second plane took 18,000 hours to produce. Using an 85% learning curve and a $30-per-hour labor charge, he wants to determine the cost of the five additional planes.

a.) Time required for the fifth unit = 14,520 hours (round your response to the nearest whole number).

b.) Cost of the fifth unit = 435600 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 neares whole number).