The radioactive material Iodine-131 decays according to the formula 
, where t is expressed in days. To the nearest hundredth, how much Iodine-131 will be left if a sample of 325 grams decays for 15 days?
A) 285.24 grams
B) 88.13 grams
C) 83.78 grams
D) 0 grams
E) None of these
Correct Answer:
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