Question

$\frac{70}{r \text{ (growth rate)}} = \text{doubling time} \\\\ r \text{ (growth rate)} = 2\\% \\\\ \text{calculate the doubling time.} \\\\ 35 \text{ years} \\\\ 140 \text{ years} \\\\ 98 \text{ years}$

Explanation:

Step1: Identify the formula and values

The formula for doubling time is $\frac{70}{r}$, where $r$ is the growth rate (in percentage). Here, $r = 2\%$.

Step2: Substitute the value of r into the formula

Substitute $r = 2$ into $\frac{70}{r}$, we get $\frac{70}{2}$.

Step3: Calculate the result

$\frac{70}{2}= 35$.

Answer:

35 years