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A drug becomes ineffective after 30 % de...

A drug becomes ineffective after 30 % decomposition. The original concentration was 10 mg mL`""^(-1)` which becomes 8.4 mg mL`""^(-1)` during first 40 months.
Assuming the decomposition of first order, calculate the expiry time of the drug in months. What is the half-life of the drug?

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892 months, 158.958 months
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