`0.69=0.69_{0}e^{-0.000121(t)}` ………………….

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1. `0.69=0.69_{0}e^{-0.000121(t)}`

   `⇔ (0.69_{0}e^{-0.000121t})/0.69_0=(0.69)/(0,69_0)`

   `⇔ e^{-0.000121t} = (0.69)/(0.69_0)`

   `⇔ -0.000121t = In((0.69)/(0.69_0))`

   `⇔ t = -(In((0.69)/(0.69_0)))/(0.000121)`

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