Question

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Answer 1

The doubling time after 4 and 7 years is 400 months and 700 months respectively

How to determine the doubling time

The formula for finding doubling time is given as;

Doubling time = $t \frac{In 2}{In 1 + \frac{r}{100} }$

Where t = time = 4 and 7 years

r = rate

For 4 years, we have

Doubling time = $4 * \frac{In 2}{In ( 1 + \frac{0.7}{100}) }$

⇒ $4 * \frac{In 2}{In 1. 0074}$

⇒ $4 * \frac{0. 6931}{0. 0074}$

⇒ $4$ × $93. 66$

⇒ 374. 65

⇒ 400 months in the nearest hundredth

For 7 years

⇒ $7$ × $93. 66$

⇒ $655. 62$

⇒ 700 months in the nearest hundredth

Thus, the doubling time after 4 and 7 years is 400 months and 700 months respectively

Learn more about doubling time here:

brainly.com/question/16407547

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