Question

Arlene buys a phone case and charging cord for 15% off. The original cost of the phone case is $18. Her total discount is $4.20.Write and solve an equation to find the original price of the charging cord

Answer 1

The total discount in Arlene's purchase was 4.20, this includes the discount applied over both, the case and the charging cord. We already know the original price of the phone case, the discount applied and the value of the discount, use it to find the original price of the chargind cord:

`\begin{gathered} 0.15(18+x)=4.20 \\ 18+x=(4.20)/(0.15) \\ 18+x=28 \\ x=28-18 \\ x=10 \end{gathered}`

The original price of the charging cord is $10