Posted by Jannet on Wednesday, February 29, 2012 at 3:33am.
Pt = Po*e^rt.
r = 12%/100% = 0.12 = APR expressed as a decimal.
t = Time in yrs.
Pt = 400*e^0.12t = 700.
e^0.12t = 700 / 400 = 1.75.
0.12t = 0.55962.(Hit Ln key).
t = 4.66 yrs.
OR
e^0.12t = 700 / 400 = 1.75.
Take Ln of both sides:
0.12t*Ln(e) = Ln1.75.
0.12t*1.0 = 0.55962.
t = 0.55962 / 0.12 = 4.66 yrs.
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