Answer:
At 42 years old you would have $2278.13.
If it doubles every six years, then you would have $1012.50.
Explanation:
$12,800
42-18= 24
24 is the years the money is growing.
24/4=6
200x2x2x2x2x2x2=12,800
if it doubles every six years it would be 200x2x2x2x2=3,200
the difference is 9,600
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