Solve. -In the Formula a = Iekt, a Is the Amount

Multiple Choice

Solve.
-In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope
Decays at a rate of 0.3% annually. Determine the half-life of this isotope, to the nearest year.

A) 167 yr
B) 100 yr
C) 2 yr
D) 231 yr