Posted by Patty on Monday, April 9, 2012 at 6:55pm.
p = ae^kt
500 = 200e^100k
2.5 = e^100k
ln 2.5 = 100k
k = ln2.5/100
p = 200e^(ln2.5/100 t)
= 200*2.5^t/100
to double,
2 = 2.5^t/100
ln 2 = (t/100)ln2.5
t = 100 * ln2/ln2.5 = 75.65 minutes
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