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For example:

H ow do you find the original amount and amount of change given the percent change and final amount?. For example:

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  1. How do you find the original amount and amount of change given the percent change and final amount? For example: At a discount furniture store, Chris offered a salesperson $600 for a couch. Chris’ offer includes 8% sales tax. If the salesperson accepts the offer, what would be the price of the couch before tax? How much was the tax?

  2. In this lesson you will learn how to find the original amount and amount of change given the percent change and final amountby using proportions and equations.

  3. Solving a Proportion 100x = 25 x 36 100x = 900

  4. Solving an Equation 100x = 900 x = 9

  5. Percent Increase/Decrease = Amount Change 40% increase/decrease in price means you just add/subtract $40 Amount increase/decrease = Final amount Increase/decrease of $40 means the final amount is $40

  6. Add or Subtract?

  7. At a discount furniture store, Chris offered a salesperson $600 for a couch. Chris’ offer includes 8% sales tax. If the salesperson accepts the offer, what would the price of the furniture be before tax? How much is the tax?

  8. Key Information: Original = ? = 100% Change = ? = 8% of Original Final = $600 = 108% of Original

  9. Option 1: Use Proportions $600 is 108% of the unknown original amount 60,000 = 108x $555.56 = x = Original $600-555.56 = $44.44 = Tax

  10. Option 2: Use Equations Let Original Amount = x = 100% x plus 8% of x = 108% of x = $600 x + 0.08x = 1.08x = 600 x = original amount = $555.56 tax = 600 – 555.56 = $44.44 Adding 8% is the same as 108% of the original amount

  11. In this lesson you have learned how to find the original amount given the percent of change and final amount by using proportions and equations.

  12. At 5 PM the price of 1 share of stock in Technology Corporation was $24. The price had fallen 20% since 9 AM. What was the price at 9AM? How much did the price decrease?

  13. On average retailers markup their selling prices 250% more than their buying prices. Make a table of the last 10 items your family has purchased. How much did they cost you? How much did they cost the retailer? How much profit did the retailer make?

  14. During the Great Depression the price of stocks fell drastically. Pretend that you owned 500 shares of stock in a company whose price per share fell 90% to a rate of $2.50 per share. What was the price per share before the Great Depression? How much did the value of your stock decrease?

  15. While watching TV Jen’s blinking rate increased 75% to 30 blinks per minute. What was Jen’s blinking rate before watching TV? How much did it change? This week a computer is 30% off its original price and is selling for $500. What was the original price? How much did it change?

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