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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!!!.

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3-7 Percent equations

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  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

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