The Active Ingredient in an Over-The-Counter Pain Killer Analgesic Decomposes

The active ingredient in an over-the-counter pain killer analgesic decomposes with a rate constant, k = 9.05 x 10¯⁴ day¯¹. How many days does it take for 15% of the original ingredient to decompose?

A) 730 days
B) 414 days
C) 365 days
D) 180 days
E) 78 days