The population of the world in 2019 was 7.71 billion people and was growing at a rate

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The population of the world in 2019 was 7.71 billion people and was growing at a rate of 1.1% per year. Assuming that this growth rate continues, the model P(t) = 7.71(1.011)t−2019 represents the population P (in billions of people) in year t.

(a) According to this model, when will the population of the world be 9 billion people?

(b) According to this model, when will the population of the world be 12.5 billion people?

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