Answer:
15.85 years
Step-by-step explanation:
The 10-year multiplier is 2, so the account value multiplier is ...
2^(t/10)
We want to find t such that this multiplier is 3.
3 = 2^(t/10)
log(3) = (t/10)log(2)
10(log(3)/log(2)) = t ≈ 15.85 . . . years
Money in the same account will triple in about 15.85 years.
