Let the amount earned from store be x and amount earned from college be y.
As per the first condition:
[tex]x+y=50450[/tex]As per the second condition:
[tex]\begin{gathered} x=3y+1250 \\ x-3y=1250 \end{gathered}[/tex]Subtract the two equations to get:
[tex]\begin{gathered} x+y=50450 \\ - \\ x-3y=1250 \\ 4y=49200 \\ y=12300 \end{gathered}[/tex]She earned 12300$ from college and 38150$ from store.
Hence the answer is 12300$