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EXAMPLE 1

3. =. 60. 75% of 60. 4. 180. =. 4. 45. =. ANSWER. 75% of 60 is. 45. EXAMPLE 1. Finding The Percent of a Number. a. Find 75% of 60. Use a fraction. 74. 0.1 . 10% of 74. =. 7.4. =. 7.4. 10% of 74 is. ANSWER. EXAMPLE 1. Finding The Percent of a Number. . b.

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EXAMPLE 1

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  1. 3 = 60 75% of 60 4 180 = 4 45 = ANSWER 75% of 60is 45. EXAMPLE 1 FindingThe Percent of a Number a. Find 75% of 60. Use a fraction.

  2. 74 0.1 10% of 74 = 7.4 = 7.4 10% of 74 is ANSWER EXAMPLE 1 FindingThe Percent of a Number . b Find 10% of 74. Use a decimal.

  3. 24 3.6 ANSWER ANSWER for Example 1 GUIDED PRACTICE 1. Find 50% of 48. 2. Find 10% of 36.

  4. 1 $10 25%of$40 $40 = = 4 − Subtract the discount STEP2 $40$10$30 = from the regular price. ANSWER The sale price of the sneakers is $30. EXAMPLE 2 Finding a Discount Discounts The regular price of a pair of sneakers is $40. The sale price is 25% off the regular price. What is the sale price? STEP 1Find the discount.

  5. = 6%of $8.50 0.06$8.50 $.51 STEP 1 = Find the sales tax. STEP 2 Add the sales tax to the cost of the item. ANSWER The total amount of your purchase is $9.01. EXAMPLE 3 Finding a Sales Tax Sales Tax You are buying dog food that costs . There is a sales tax. What is total amount of your purchase? $8.50 6% $8.50$.51$9.01 + =

  6. 3. Discounts ANSWER The sale price of the book is $15.96. ANSWER The total cost is $10.26. for Example 2 ,3 and 4 GUIDED PRACTICE A book’s regular price is $19.95. Find the sale price with a 20% discount. 4. Tax The price of a cat toy is $9.50. Find the total cost with a sales tax of 8%.

  7. 5. Tip ANSWER The total cost is $5.50. for Example 2 ,3 and 4 GUIDED PRACTICE The price of a shoe shine is $4.75. Use mental math to estimate the total cost if you tip 15%.

  8. EXAMPLE 5 Standardized Test Practice

  9. STEP 1 Write an expression to find 15% of the bill. 0.15(28.60) STEP 2 Add the expression to the bill. 28.60+0.15(28.60) ANSWER An Equation to find the total cost is t = 28.60 + 0.15(28.60) The correctanswer is C. EXAMPLE 5 Standardized Test Practice SOLUTION

  10. EXAMPLE 6 Finding Simple Interest Savings: You deposit in an account. The annual interest rate is 4%. How much simple interest will you earn in years? $75 2 = I Prt Write the simple interest formula. Substitute values. Write 4% as a decimal. 75(0.04)(2) = 6 Multiply. = You will earn $6 in simple interest in 2 years. ANSWER

  11. EXAMPLE 6 for Examples 5 and 6 GUIDED PRACTICE 6.Tips Breakfast for you and a friend costs $12.09, and you leave a 20% tip. Which equation would you use to findt, the total amount paid in dollars: t = 0.2(12.09) or t = 0.2(12.09) + 12.09? Find the total amount paid. t = 0.2(12.09) + 12.09; t = $14.51 7.Savings You deposit $100 in a bank account. The annual interest rate is 3%. How much simple interest will you earn in 3 years? $9.00

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