Solve the Problem $\mathrm { A } = \mathrm { A } _ { 0 } \mathrm { e } ^ { - 0.0099 \mathrm { x } }$

Multiple Choice

Solve the problem.
-The function $\mathrm { A } = \mathrm { A } _ { 0 } \mathrm { e } ^ { - 0.0099 \mathrm { x } }$ models the amount in pounds of a particular radioactive material stored in a concrete vault, where $x$ is the number of years since the material was put into the vault. If 800 pounds of the material are initially put into the vault, how many pounds will be left after 190 years?

A) 122 pounds
B) 620 pounds
C) 1086 pounds
D) 147 pounds