1 / 12

3-7 Percent equations

3-7 Percent equations. Miss battaglia – algebra 1 CP Objective: Use equations to solve problems involving percents and find simple interest. Warm up. Solve each equation. 1) 3.2(m + 5) = 16 2) . Quick review!!!.

isha
Download Presentation

3-7 Percent equations

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 3-7 Percent equations Miss battaglia – algebra 1 CP Objective: Use equations to solve problems involving percents and find simple interest.

  2. Warm up • Solve each equation. • 1) 3.2(m + 5) = 16 2)

  3. Quick review!!! • A percent is a ratio that compares a number to 100. You can write a percent with the percent symbol as a fraction or a decimal. • Ex: 40% = = .40

  4. Symbols represent words What is 40% of 8? n = .40 x 8

  5. Write an equation to model each question. • What is 25% of 12? • 3 is 75% of what? • What percent of 44 is 11? • 16% of what is 200?

  6. sales • Suppose you work at a computer store. You earn 5% commission on everything you sell. How much do you earn on a computer you sell for $1900.

  7. In a survey, 1650 students said that drug abuse is the number one problem in the world today. How many students were surveyed? surveys

  8. Think about it… • Can percents be numbers greater than 100? If yes, give an example.

  9. example • Suppose SHS requires 36 hours of community service. You spent 56 hours volunteering at a hospital. What percent of the requirement have you fulfilled?

  10. Simple interest • Today banks use compound interest, which we will study in Chapter 8. Compound interest is based on simple interest. Its formula is I = prt. (I = interest, p = principal, r = rate per year, t = time in years) • Ex: I = ? if p = $340, r = 6%, t = 3 yr

  11. finance • Suppose you invested $900 for two years. You earned $67.50 in simple interest. What was the annual rate of interest?

  12. homework • Pg 142-143 # 2, 4, 5, 8 , 9 , 11, 12, 13, 20, 22, 23, 27, 36, 38

More Related