Plutonium Has a Half Life Of $2.4 \times 10 ^ { 4 }$

Multiple Choice

Plutonium has a half life of $2.4 \times 10 ^ { 4 }$ years. How long does it take for $99.0 \%$ of the plutonium to decay?

A) $1.6 \times 10 ^ { 3 } \mathrm { y }$
B) $1.6 \times 10 ^ { 5 } \mathrm { y }$
C) $1.6 \times 10 ^ { 2 } \mathrm { y }$
D) $1.6 \times 10 ^ { 6 } \mathrm { y }$
E) $1.6 \times 10 ^ { 4 } \mathrm { y }$