Percent
Percent Error
Simple Interest
Multi-Step Problems
Percent Change
100
15% of 45
6.75
100
What is the formula for percent error?
|actual - experimental||. x 100
actual100
P = 400
r = 0.15
t = 3
What is I?
180
100
A bicycle is on sale for $189.50. The sales tax rate is 5%. What is the total price?
$198.98
100
100 reduced to 80.
What percent has it decreased by?
20% discount
200
25% of 340
85
200
The report said the carpark held 240 cars, but we counted only 200 parking spaces. What was the percent error?
20%
200
I = 49.92
P = 130
t = 4
What is the rate?
9.6%
200
Rosa and her friends are eating out for dinner. The bill was $45.80. They want to leave a 20% tip. How much should they leave for tip?
$9.16
200
$12 increases to $15.
What is the percent change?
25% Increase
300
12 out of 20 on exam.
What is the %?
60%
300
DOUBLE JEOPARDY
Your team wins 300 points
Woot woot
300
Isabella deposited $500 into a savings account at a local bank that earned 5
% interest per year. How much interest does she earn per year?
Isabella earns $27.50 per year in interest from her local bank.
300
A real estate agent sold a house for $315,000 last week. If her commission is 1.25% of the selling price of the home, find the amount of her commission.
#3,937.50
300
45 becomes 70.
What is the percent increase?
55.56%
400
Bag of marbles contains 5 red, 6 bue and 3 green.
What percentage are blue?
42.86%
400
Joshua uses his thermometer and finds the boiling point of ethyl alcohol to be 75o C. He looks in a reference book and finds that the actual boiling point of ethyl alcohol is 80oC. What is his percent error?
6.25%
400
To buy a computer, Raquel borrowed $3,000 at 9% interest for 4 years. How much money did she have to pay back?
$4,080.00.
400
Double Jeopardy
Every team but yours losses 400 points (that is the same as your team winning the points)
Eek
400
A persons salary changes from $2 400 a month to $3 000 a month. What is the percent change?
25% increase
500
Game 1 of soccer you scored 9 goals out of 14 attempts.
Game 2 you scored 11 goals out of 17 attempts.
Which game did you have the greatest accuracy and by what percentage? Round your answer to the nearest tenth.
Game 2 by 64.7%
500
The Handbook of Chemistry and Physics lists the density of a certain liquid to be 0.7988 g/mL. Taylor experimentally finds this liquid to have a density of 0.7925 g/mL. The teacher allows up to +/- 0.500% error to make an “A” on the lab. Did Fred make an “A”? Prove your answer.
0.79%
õ
500
When Kevin bought a new office phone, he borrowed $1,200 at a rate of 18% for 9 months. How much interest did he pay?
Kevin paid $162.00 in interest.
500
At a restaurant you only have $20 to spend on dinner. In addition to the cost of the meal you must pay a 5% sales tax and leave a 15% tip. What is the most expensive item you can order?
$16.56
500
You own 45 books. If you donated 12 books to charity. By what percent has your number of books changed?
26.67% decrease