Question

The original price of a DVD is represented by the variable x. If the DVD is discounted 45%, write a subtraction expression and a multiplication expression to represent its sale price?

Answer 1

Let's call the sale price `s`

Explanation:

Subtraction :
Then the discount is `45%` of `x`
`s=x-45/100x=x-(cancel5xx9)/(cancel5xx20)x=x-9/20x`
The answer could also have been expressed as
`s=x-0.45x`

Multiplication :
Then `s` is `100%-45%=55%` of `x` or:
`s=55/100x=(cancel5xx11)/(cancel5xx20)x=11/20x`
Or:
`s=0.55x`