Answer
$g(t)=\dfrac{3}{4}f(t)$
Work Step by Step
As the profits $g(t)$ are $\dfrac{3}{4}$ of what was expected ($f(t)$), we can write:
$g(t)=\dfrac{3}{4}f(t)$
$g(t)$ is a vertical shrink of $f(t)$.
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