Answer:
Marge has earned $60.
Step-by-step explanation:
Let the total money she earned be x.
Money spent o the phone = [tex]\frac{1}{2}x=0.5x[/tex]
Money left with Marge after buying phone= x - 0.5 x = 0.5 x
Money spent on the gift= [tex]\frac{0.5x}{2}=0.25x[/tex]
Money left with Marge after buying gift= 0.5 x - 0.25 x = 0.25x
Final amount left with marge = $15
[tex]\$15=0.25x[/tex]
[tex]x=\frac{\$15}{0.25}=\$60[/tex]
Marge has earned $60.
