# 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?

##### 1 Answer
Nov 20, 2016

Let's call the sale price $s$

#### Explanation:

Subtraction :
Then the discount is 45% of $x$
$s = x - \frac{45}{100} x = x - \frac{\cancel{5} \times 9}{\cancel{5} \times 20} x = x - \frac{9}{20} x$
The answer could also have been expressed as
$s = x - 0.45 x$

Multiplication :
Then $s$ is 100%-45%=55% of $x$ or:
$s = \frac{55}{100} x = \frac{\cancel{5} \times 11}{\cancel{5} \times 20} x = \frac{11}{20} x$
Or:
$s = 0.55 x$