Answer:
$450 is the original price
Explanation:
We can create a proportion to find the sale on the original price. A proportion is an equation where two ratios are set equal to each other. We create two fractions using the prices and percents. It is marked down by 30% so we pay 70% of the original. The sale price is $315.

We begin solving by cross multiplying numerator to denominator of each fraction.
