please show me steps

Suad Alwan, the prchasing agent for Dubai airlines has found that the third plane it needed from brazilian manufacturer took that firm 20,000 hours to produce. Using an 85% learning curve and a $40 per-hour labor charge. Suad wishes to calculate what twelve additional planes should cost.

questions:

time required for twelveth unit= (hours)

cost of the twelfth unit= dollars

time required for 13th unit=

cost of the 13th unit =

time required for the 14th unit

cost of the 14th unit

time required for the 15th unit

cost of the 15th unit

the combined time for four planes= hours

the combined cost for the four planes= dollars

Alwar, the purchasing Duela urte de format took that 20.000 hours to sing and how the e what we donne Costed the world where