Show:
9-1 The Percent Equation
9-2 Using the Percent Equation
9-3 Simple Interest
9-5 Percent Increase and Percent Decrease
9-6 Percent Markup and Percent Markdown
100
Decide whether the question is looking for a part, the percent or the whole: What is 56% of 16?
part
100
If you are shopping and purchase a shirt for $20.00 and the sales tax rate is 7%, how much do you pay in sales tax? Show your setup using the percent equation and then solve.
Part = 7% x 20 ; $1.40
100
You open a savings account with a principal of $200 and a simple interest rate of 4%. How much interest will you earn in 5 years? Show your setup using the simple interest equation and then solve.
I = 200 x 4% x 5 ; $40
100
The original quantity is 10 and the new quantity is 14, what is the percent increase?
40%
100
A computer store bought a program at a cost of $10 and sold it at a selling price of $16. 1) What is the markup? 2) What is the percent markup?
1) $6 2) 60%
200
What is 25% of 300?
75
200
You earn commission at a rate of 3%. Your sales this week were $600. What did you earn in commission this week? Show your setup using the percent equation and then solve.
commission = 3% x 600 ; $18.00
200
If the simple interest on $2000 for 3 years is $420, then what is the interest rate? Show the setup in the simple interest equation and then solve.
420 = 2000 x r x 3 ; 7%
200
Bradley collects Pokemon. This morning he had 200 and now he has 235. What is his percent increase? (do not round)
17.5%
200
A store bought a toy for a cost of $10. When the store sold the toy, the percent markup was 40%. 1) What was the markup? 2) What was the selling price?
1) $4 2) $14
300
10 is what percent of 50?
20%
300
A salesperson at a jewelry store earns 5% commission each week. Last week he sold $750 worth of jewelry. How much did the salesman make in commission? How much did the store make from his sales?
The salesman made $37.50. The store made $712.50.
300
If you earned $500 in simple interest in 5 years at a simple interest rate of 4%, what was your initial principal investment?
500 = p x 4% x 5 ; $2500
300
Michael has to read a book for ELA class. On Monday Michael had 200 pages to read and now he has only 30 left. What is the percent decrease in number of pages he has to read between Monday and now?
85% decrease
300
You found a jersey for sale for $45. You wait for a 20% off sale. 1) What is the percent markdown? 2) What is the markdown?
1) 20% 2) $9
400
Al local little league has a total of 90 players, of whom 40% are right-handed. How many right-handed players are there? Show your setup using the Percent Equation and then solve.
part = 40% X 90 ; 36
400
A salesperson works 40 hours per week at a job where his average sales are expected to be $2500 per week. He can be paid in two different ways: Option A is an hourly wage of $9. Option B is a commission rate of 8% on weekly sales. 1) Which Option should he choose to earn the most money? 2) How much does he make in a week with option A? 3) How much does he make in a week with option B?
1) option A 2) $360 (9 x 40 = 360) 3) $200 (commission = 8% x 2500)
400
You deposit $400 in a savings account and keep it in the bank for 6 years. The annual interest rate is 5%. What is the simple interest you earn in the 6 years? What is your balance including interest?
$120 ; $520
400
Last year there were 34 members in the Math club and now there are 25. What is the percent change in membership within the Math club? (round to the nearest whole percent) Is the change an increase or decrease?
26% ; decrease
400
A department store buys 300 shirts at a cost of $2400 and sells them at a selling price of $10 each. Find the percent markup.
25%
500
In a survey of 2000 people who owned a certain type of car, 900 said they would buy that type of car again. What percent of the people surveyed were satisfied with the car? Show the setup in the percent equation and then answer the question.
900 = Percent x 2000 ; 45%
500
You eat at a restaurant and your total bill is $125. You want to leave a 20% tip for the waitress. How much do you spend at the restaurant including the tip?
$150
500
You have $200 and want to earn some money. Which of the following options makes you more money? Option A: Put it in savings and earn 3% simple interest. Option B: Loan it to your brother who says he will pay you $5 if you let him keep it for a year. (Assume your brother is good for it.) Option C: Put it in a shoebox in your closet where it will be safe.
Option A ...because you will earn $6 rather than $5 or nothing.
500
There are 250 7th graders at Landon. During the Driftwood trip 100 students will be absent from school due to the trip. What is the expected percent decrease in attendance at Landon for 7th graders during the Driftwood trip?
40%
500
A band expects to put 15 songs on their next CD. The band writes and records 20% more songs than they expect to put on the CD. During the editing process, 50% of the songs are removed. How many songs will there be on the final CD?
9 songs