Answer
$10\%$; $2\%$; $1\%$; $0.5\%$
Work Step by Step
Use the Rule of $70$:
$\text{Growth rate}=\frac{70}{\text{Years to double}}.$
In $7$ years: $\frac{70}{7}=10\%$
In $35$ years: $\frac{70}{35}=2\%$
In $70$ years: $\frac{70}{7=}=1\%$
In $140$ years: $\frac{70}{140}=0.5\%$
