0657)^{t},$$ where $f(t)$ is the GDP (in billions of current dollars) and $t$ is the number of years since 1930. We want to find the year when the GDP will reach $29,930 billion. So, we set $f(t)$ equal to $29,930$ and solve for $t$:
$$29930 = 92(1.0657)^{t}.$$
Show more…