During a weekend sale, every item in a clothing store is discounted by 15%. What is the sale price, in dollars, of a jacket originally priced at $60?
A percent discount takes part of the original price away. Start with and subtract the discount percent to find what remains. Then use Desmos to calculate that remaining percent of the original price. Calculating the discount percent alone gives the amount saved, not the sale price.
Hints
- Hint 1
The original price is the full . A discount removes part of it, so find the percent left before calculating a dollar amount. What remains after is taken off?
- Hint 2
The sale price is what you pay, not what you save. Take the remaining percent of the original $60. In Desmos, the original price goes after
of.
Step-by-step
Find the percent left
Step 1Find how much of the price remains
A discount is the part taken off the original price. Start with the full , then subtract the removed:
- Step 2
Write the sale-price expression
The sale price is the amount left to pay, so it is of the jacket's original $60 price:
Using instead would find only the amount saved.
- Step 3
Calculate the price in Desmos
Type in Desmos. It prints , so the jacket's sale price is $51. For a discount, calculate the percent left, not the percent removed. Choice B.