The original cost of the cereal box is $5.00 → this represents a 100% of the price
You saved $2.00 by using a coupon, to determine the % of discount this coupon represents you can use cross multiplication:
If $5 represents 100%
$2 represents x%
Where:
[tex]\begin{gathered} \frac{100}{5}=\frac{x}{2} \\ x=(\frac{100}{5})\cdot2 \\ x=40 \end{gathered}[/tex]The coupon represented a 40% discount on the cereal box.
