A drug is known to be ineffective after it has decomposed to the extent of 30%. The original concentration of a sample was 500 units/mL. When analysed 20 months later, the concentration was found to be 420 units/mL. Assuming that the decomposition is of first order, what will be the expiration time of the drug sample. What is the half life of the drug? (a) 0.00872 month, 41 month (b) 0.00872 month, 79.49 month (c) 41 month, 79.49 month (d) 79.49 month, 41 month
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