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Living matter has 1.3 x 10-10% of its carbon in the form of 14C which has...

Living matter has 1.3 x 10-10% of its carbon in the form of 14C which has a half-life of 5730 yr. A mammoth bone has a 300 g sample of carbon separated from it, and the sample is found to have an activity of 20 decays per second. How old is the bone?

a) 6,400 yr

b) 7,600 yr

c) 10,900 yr

d) 11,500 yr

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