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200000=100000(1+0.12)^N

2=(1.12)^N

Solving for an exponent... time to break out the logs!

log 2 = log (1.12^N) = N log 1.12

Did you remember that log rule? `logA^x=xlogA`

N = log 2 / log 1.12 = 6.12 yrs (so 7 years).

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