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Percent Increase/Decrease
Part = Percent x Whole
Percent Error
Simple Interest
Proportions
100
Yesterday, you ate 3 cookies and today you had 6. What is the percent increase?
What is 50% increase?
100
The shoes cost $50 and there is a sales tax of 7% applied. How much sales tax will you pay on the shoes?
What is $3.50?
100
I estimated that the repairs to my car would cost $80. In fact they cost $120. What was the percentage error?
What is 33.3% percent error?
100
The Simple Interest Formula
What is Interest = Principal x Rate x Time
100
To find constant of proportionality, do we divide y/x or x/y?
What is y/x ?
200
Keelah’s Clothing Store buys coats for $50 and then sells them for $80. What is the percent increase of the coat?
What is 60% increase?
200
You are at a restaurant and the bill comes to $2000. You decide to give a tip that is equal to 20% of the bill. How much is the tip?
What is 400?
200
Peter expected to earn $425 in a week. In fact he earned $500. What was the percentage error?
What is 15% percent error?
200
Jordan put $100 in a savings account for 1 year. The interest rate is 10%. How much interest did Jordan earn in 1 year?
What is $10?
200
What is the constant of proportionality of this ordered pair (2, 6)
What is 3?
300
What is the percent decrease from 85 hours to 74 hours
What is 12.9% decrease?
300
What percent is 50 of 80?
What is 62.50% ?
300
I expected to get $50 for my birthday, but I only got $35. What was the percentage error?
What is 42.9% percent error?
300
Kayla went to the bank and deposited $50. The yearly interest rate is 5%. How much did she earn after 1 year?
What is $2.50?
300
x y 2 24 4 48 6 72 8 96 What is the constant of proportionality?
What is 12?
400
From 36 inches to 90 inches. What is the percent increase?
What is 150% increase?
400
60 is what percent of 120?
What is 50%?
400
Jim expected 24 people to turn up for a job interview, but only 18 did. What was the percentage error?
What is 33.3% percent error?
400
Mark has $500 in his bank account. Each year it grows 2%, how much will he have after 6 months?
What is $5?
400
What is the equation of the constant of proportionality for this ordered pair? (5, 10)
What is y=2x ?
500
From 117 minutes to 91 minutes State whether it is an increase or decrease AND the percent
What is 22% decrease?
500
The shirt is on sale for 40%. If the shirt is on sale for $20, how much did the shirt originally cost?
What is $50?
500
1,500 people were expected to attend a rock concert, but only 1,350 turned up. What was the percentage error?
What is 11.1% percent error?
500
Tyler has a loan of $1200 that grows interest 4.5% each year. He will only borrow the loan for ten months. How much interest will grow on the loan?
What is $1200?
500
Write an equation with the constant of proportionality of this ordered pair. (16, 4)
What is y=1/4x ?