Halflife question. Physics.?

Hexame™

New member
A small sample of material taken from a plant contains 32 billion atoms of carbon-14.
Approximately how many of these atoms will it contain in 13 000 years time?

1) 4 billion
2) 7 billion
3) 15 billion
4) 30 billion


Got a GCSE exam okay on most stuff except this, I just can't seem to understand this question.!!! HELP please asap!!!!!
 
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