Solve the Problem $1 \%$ Per 400 Years $t$ Represents Time in Years and Y Represents the Amount of Rate

Multiple Choice

Solve the problem.
-A certain radioactive isotope decays at a rate of $1 \%$ per 400 years. If $t$ represents time in years and y represents the amount of the isotope left, use the condition that $\mathrm { y } = 0.99 \mathrm { y } 0$ to find the value of $\mathrm { k }$ in the equation $\mathrm { y } = \mathrm { y } _ { 0 } \mathrm { e } ^ { \mathrm { kt } }$ .

A) 0.00003
B) -0.00003
C) -0.01005
D) 0.00673