2 9 Percents Objective To solve percent problems

2 -9 Percents Objective: To solve percent problems using proportions. To solve percent problems using the percent equation.

Warm-Up: Some recommended daily intakes of vitamins are shown. Carrie consumed 10 mg of niacin today. Her brother consumed 11 mg. Of niacin. Who consumed the greater percent of their recommended intake? How do you know?

Percent Proportion DO NOT USE “IS over OF”

Ex 1: What percent of 56 is 42? Ex 2: What percent of 90 is 54?

Solve for “part” by using cross multiplication The Percent Equation

Ex 3: What percent of 40 is 2. 5? Ex 4: What percent of 84 is 63?

Ex 5: Word Problem A dress shirt that normally costs $38. 50 is on sale for 30% off. What is the sale price of the shirt?

Ex 6: Word Problem A family sells a car to a dealership for 60% less than they paid for it. They paid $9000 for the car. For what price did they sell the car?

Ex 7: 125% of what number is 17. 5? Ex 8: 30% of what number is 12. 5?

Simple Interest Formula Ex 9: If you invest $50 at a simple interest rate of 3. 5% per year for 3 years. What is the interest you earn?

Ex 10: You deposited $840 in a savings account that earns a simple interest rate of 4. 5% per year. You want to keep the money in the account for 4 years. How much interest will you earn? Check your answer for reasonableness.

Classwork 2 -9 P. 141 #s 9 -29 odd

Homework 2 -9 P. 141 #s 10 -30 even

Classwork Answers 2 -9 P. 141 #s 9 -29 odd 9) 20% 21) $52 11) 62. 5% 23) 400 13) 41 2/3 % 25) 22. 5 15) 36 27) 22 2/3 17) 13 29) $108 19) 16

Homework Answers 2 -9 P. 141 #s 10 -30 even 10) 500% 22) $6. 30 12) 125% 24) 25 14) 100% 26) 125 16) 94. 5 28) 100 18) 94. 5 30) $33 20) 0. 01

2 -6 to 2 -9 Quiz Review Objective: To solve percent problems using proportions. To solve percent problems using the percent equation.

Homework Answers 2 -6 to 2 -9 Quiz Review 10) 14 people 16) $6. 30 11) 6 in. 17) $33 12) 30% 13) 120% 14) 28 15) 48

Classwork 2 -6 Practice #s 4 -16 even, omit #s 6, 8, & 16 2 -7 Practice evens 2 -8 Practice evens 2 -9 Practice evens

Homework 2 -6 Practice #s 4 -16 even, omit #s 6, 8, & 16 2 -7 Practice evens 2 -8 Practice evens 2 -9 Practice evens

Classwork Answers 2 -9 P. 141 #s 9 -29 odd 9) 20% 21) $52 11) 62. 5% 23) 400 13) 41 2/3 % 25) 22. 5 15) 36 27) 22 2/3 17) 13 29) $108 19) 16

Homework Answers 2 -9 P. 141 #s 10 -30 even 10) 500% 22) $6. 30 12) 125% 24) 25 14) 100% 26) 125 16) 94. 5 28) 100 18) 94. 5 30) $33 20) 0. 01