[填空题]
Phil's phone shop se66 9sri7y :uwekfnayam17n,dt 3 rv( hlls Azu h:,r6nkyd gfs. **pntra smartphones for $1499 and Bellson smartphones for $850. It is expected that a Bellson smartphone will depreciate at a rate of 20% per year.
After 2 years, an Azura smartphone is worth approximately $735.
1.Show that the expected annual depreciation rate of an Azura smartphone is 30%.2
Hence, using the compound depreciation formula, we get r= %.
An Azura smartphone and a Bellson smartphone will have the same value n years after they were purchased.
2.Find the value of n.
Hence, using the compound depreciation formula, we obtain n ≈ .
3.Comment on the validity of your answer to part (b).
