First order reactionMedium

Drug Decomposition and Expiry Kinetics

Drug $X$ becomes ineffective after $50\%$ decomposition. The original concentration of drug in a bottle was $16\,\text{mg}/\text{mL}$ , which becomes $4\,\text{mg}/\text{mL}$ , in 12 months. The expiry time of the drug in months is ______
Assume that decomposition of drug follows first order kinetics

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