Answer
$y=210,000(1.125)^t$.
Work Step by Step
Initial value $a=\$210,000$
Rate of growth $r=12.5\%=0.125$
The exponential growth function is
$\Rightarrow y=a(1+r)^t$
Substitute $210,000$ for $a$ and $0.125$ for $r$.
$\Rightarrow y=210,000(1+0.125)^t$
Simplify.
$\Rightarrow y=210,000(1.125)^t$.
