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The decay constant for a given radionuclide has a value of 1.386 day^-1 . Aftef how much time will a given sample of this radionuclide get refuced to 6.25% of its present number .
Here is it possible to use both formulae ( R=R0 e raised to -lambda t ) and R/R0 = (12)^n
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https://www.meritnation.com/ask-answer/question/the-decay-constant-for-a-given-radioactive-sample-is-0-3465/nuclei/5889378