A population of insects increases at a rate of 1 point 5 percent per day. About how long will it take the population to double?

For daily growth of 1.5%, the population is multiplied by 1.015 each day. Solve 1.015^t = 2, which gives t = ln(2) / ln(1.015) ≈ 46.6 days. So the population will take about 46.6 days to double, choice C.

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