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That was my answer.

Son thought it had to do with every 10 years, 120,000 are born so in a thousand years 12,000,000 births would give you a rate of 1.2.

Not really a for credit problem, they just turn in their homework, get credit that they've worked on it and then discuss it.

Sorry, meant 12, not 1.2.

And therein is the problem, some folks are getting what my son things the answer is and some are getting what I think the answer is.

The conflict continues, LOL.

Son thought it had to do with every 10 years, 120,000 are born so in a thousand years 12,000,000 births would give you a rate of 1.2.

I hate to say it but he may be right. We've been assuming that all the antelope born, lived; but if each one has 5 progeny in ten years and they all live, there's no way the population can stay at 24,000 antelope. So if a lot were killed to hold the population constant, their births add to the number of mutations even though they don't show up as a change in the population.

Thank God I'm a recognized numbers dolt; otherwise I'd be so embarrassed!