Investment (PV) = $1,000
number of year (n) = 62-20 = 42 years
Interest rate = 12% = 0.12
The future value (FV) is calculated using the formula :
FV = PV*(1+r)^n where
PV =1000
r = 0.12
n = 42
FV = 1000*(1+0.12)^42
FV =1000*1.12^42
FV = 116,723.14 (Rounded to 2 decimals)
Therefore, Arnold's savings will have grown to approximately $116,723.14 by age 62.