1. Percent change and taxes Chapter 9 sec 1

2. Percent Def. ◦ Derived from the latin “per centum”. Which means “per hundred”. ◦ Example  17% =.017 =

3. Problems 36.74% =.3674 = Viewing the decimal,.3 is the hundredth place, the.36, the number 6 is the thousandth place.

4. Key words to help you The word “of” in mathematics means multiplication. The word “is” is used as equal to.

5. Percent Equation Here is the equation that you will need to solve. Percent * base = amount

6. Problems A) Write as a decimal and as a %. B) What is 47% of 80? C) 74 is 45% of what number? D) 234 is what percent of 745?

7. Solution A) =.4286 = 42.86% B) First change the % to a decimal or fraction. ◦.◦. 47*80 = 37.6

8. C) 74 =.45 * x, where x is some number. X = 164.44 D) 234 = x * 745 =.314 = 31.4%

9. Percent change Percent change =

10. Daishu’s Electronics is having an quarter of year clearance in which the TV and radio ads proclaim that all electronics are sold at 5% markup over the dealer’s cost. Daishu has a 57’’ Flatscreen TV for sale for $2,889. On the internet, you find out that this particular model has a dealer cost of 2,700. Is Daishu being honest in his advertising?

11. To determine if Daishu is honest or not, you would use the percent change equation.

12. Solution % change = = = 0.07 = 7%