Question

Caffenine leaves the body at a rate of 15.6% each hour. Your first cup of coffee in the morning has 100 mg of caffenine.

How long will it take before you have 50 mg and 25 mg of that caffenine in your body.

Answer 1

\[N(t) = N_0*e^{-\lambda t}\]
http://en.wikipedia.org/wiki/Exponential_decay

Answer 2

thanks

Answer 3

you're welcome :)