Since Michael has $50, we have that $125-$50=$75. Then we can find which percentage is $75 from $125 using a simple rule of three:
[tex]\begin{gathered} \text{ \$125 }\rightarrow\text{ 100\%} \\ \text{ \$75 }\rightarrow\text{ x \%} \\ \Rightarrow x=\frac{75\cdot100}{125}=\frac{7500}{125}=60 \\ x=60 \end{gathered}[/tex]Therefore, 60% of the money is Jonathan's