I'm having a little difficulty solving growth/decay facts, I suppose this question is about that but I'm having a little difficulty understanding what it means
Question: Keller industries' profit were up this year over last year. This was an increase of
Let T represent the profit this year and L the profit from last year and write a system of equations that can be used to determine the profits?
either will work. Since you have two expressions for T you might as well just set them equal and immediately eliminate T from the mix. You'd get
$L+\dfrac{12.5}{100}\cdot L = L + 50,000$
and this can be solved for $L$
$L$ can then be used to find $T$ from either equation.