Final answer:
The estimated salvage value of the airplane after 5 years is approximately $177,147.
Step-by-step explanation:
To find the estimated salvage value of the airplane after 5 years, we can substitute t = 5 into the formula for s(t).
s(t) = 300,000(0.9)t
s(5) = 300,000(0.9)5
s(5) = 300,000(0.59049)
s(5) ≈ $177,147
Therefore, the estimated salvage value of the airplane after 5 years is approximately $177,147.