Solve the Problem $984 \mathrm { mg }$ Of an Isotope Is Given By

Multiple Choice

Solve the problem.
-The decay of $984 \mathrm { mg }$ of an isotope is given by $\mathrm { A } ( \mathrm { t } ) = 984 \mathrm { e } ^ { - 0.014 \mathrm { t } }$ , where $\mathrm { t }$ is time in years. Find the amount left after 12 years.

A) 416
B) 970
C) 820
D) 832