Gavin wrote the equation $p=\frac{3(s+100)}{4}$ to represent $p$, the profit he makes from $s$ sales in his lawn-mowing business. Which equation is solved for $s$ ?
A$s=\frac{p-100}{3}$
B$s=\frac{4 p-300}{3}$
C$s=\frac{4 p}{300}$
D$s=\frac{400 p}{3}$
A$s=\frac{p-100}{3}$
B$s=\frac{4 p-300}{3}$
C$s=\frac{4 p}{300}$
D$s=\frac{400 p}{3}$