Hi there!
cost=64.0125
1.Multiply percent with 0.01:
[tex]25[/tex]·[tex]0.01=0.25[/tex]
2.Multiply the cost and term:
[tex]85.35[/tex]·[tex]0.25= 21.3375[/tex]
3.Subtract first term with the decrease of cost:
[tex]85.35-21.3375= 64.0125[/tex]
Therefore, the sale price of the girl is now 64.0125$