1. Algebra 1 Notes
3.7 Percent of Change

2. Example 1 original: 25 new: 18 Percent of increase or decrease?
Find the percent of change.
Since the new number is less than the original, this is % of decrease.

3. Example 2
original: new: 70 Percent of increase or decrease?
Find the percent of change.
40% = r

4. Example 3
To be marked “reduced fat” a food must have at least 25% less fat than the same full fat food. If one ounce of reduced fat chips has 6 grams of fat less than the full fat chips, what is the least amount of fat in one ounce of regular chips?

5. Discounts and mark ups To figure a discount: To figure a mark up:
SUBTRACT the percentage of the discount from 100%
convert to a decimal
then multiply this by the price of the item.
To figure a mark up:
ADD the percentage of the mark up to 100%

6. Example 4
Find the discounted price. Suit: $175.95; Discount: 45%

7. Example 5
Find the total price. Clock: $39.95; Tax: 6.75%