Chapter 5 - Exponential Functions - 5.5 Exponential Growth and Decay Rates and Compounding Interest - 5.5 Exercises - Page 469: 5

$250\%$ growth.

Growth or decay rate $r=b-1$ where $r$ is a percentage written as a decimal and $b$ is the base of an exponential function of the form $f(x)=a\cdot b^{x}$. Given $f(x)=2(3.5)^{x}$ $\implies b=3.5$ $r=b-1=3.5-1=2.5$ Or $r=2.5\times100 \%=250\% $ $r$ is positive. So, there is $250\%$ growth.