[填空题]
Alex invests an amount of USD into a savings account which pays 3.3%v +w7v j .,yqquylz,c9l3 s3fb (ye 7i(d:4zsx rp.a.) interest, compounded monthly. After 5 years Alex has 800xz:i 7e(dy 4sr0 USD in the account.
1.Find the amount of USD initially invested, rounding your answer to two decimal places.
With this money, Alex purchases a used car for 5000 dollars, and sells it 3 years later for 4200.
2.Find the rate at which the car depreciates per year over the 3 year period.
We can use the compound depreciation formula to solve for r= .
