149. To determine the shelf life of papaverine hydrochloride powder, "accelerated aging" was carried out at temperatures of 60 C and 80 C, the decomposition rate constants are respectively 2.17*10-5 h-1 and 4.17*10-5 h-1. Determine the expiration date of the powder at a temperature of 25 C (considering that it is good if 10% of the substance decomposes).

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