Solve
-The Function $\mathrm{A}=\mathrm{A}_{0} \mathrm{e}^{-0.01386 \mathrm{x}}$ Models the Amount in Pounds of a Particular Radioactive Material

Multiple Choice

Solve.
-The function $\mathrm{A}=\mathrm{A}_{0} \mathrm{e}^{-0.01386 \mathrm{x}}$ models the amount in pounds of a particular radioactive material stored in a concrete vault, where $\mathrm{x}$ is the number of years since the material was put into the vault. If 700 pounds of the material are plaœed in the vault, how much time will need to pass for only 152 pounds to remain?

A) $115 \mathrm{yr}$
B) $110 \mathrm{yr}$
C) $220 \mathrm{yr}$
D) $120 \mathrm{yr}$