Percent to Decimal/Decimal to Percent
Percent Proportion/Percent Equation
Percent Change/Percent Error
Sales Tax, Tip, Discount
Simple Interest
100
Convert 120% to a decimal.
What is 1.2
100
Use the percent proportion to solve: If 12 out of 25 people like blue jolly ranchers. What percent of people like blue jolly ranchers?
What is 48% of people
100
A fruit drink that was sold in 16-ounce containers is now sold in 20-ounce containers. What is the percent of change in quantity? State whether this is an increase or a decrease.
What is 25% increase.
100
How much would a bicycle cost if it were marked down 15% from its original price of $289?
What is $245.65.
100

Name the simple interest formula and state what each variable stands for.

What is I = prt I = interest p = principal r = % as a decimal t = time in years

200
Convert 4.9% to a decimal.
What is .049
200
Use the percent equation to solve: The local bakery sells 150 donuts a day. If 70% if these donuts are sold in the morning, how many donuts are sold in the morning?
What is 105 donuts
200
On Tuesday, Nash made 231 free throws on Wednesday he made 258 free throws. What is the percent change in his free throws? Round to the nearest percent. State whether this is increase or decrease.
What is 12% increase.
200
If a sweater costs $37.99, and the sales tax is 6%, what is the total price of the sweater?
What is $40.27.
200

If you invest $1200 in an account that pays 13.2% simple interest, what is the balance of the account after 4 years?

What is $633.60

300
Convert .008 to a percent
What is 0.8%
300
Use the percent equation. 0.5% of all statistics are true. If you have a list of 1,400 statistics. How many are true?
What is 7 statistics.
300
Al's Quick Mart sells milk for $1.99 per gallon, but they used to sell it for $2.79. What is the percent change in the price? Round to the nearest whole percent. State whether this is increase or decrease.
What is 40% decrease.
300
A certain container of mouthwash usually costs $2.99 at a store. If it is on sale for 20% off, how much does the mouthwash cost now?
What is $3.59
300

You invest $5,000 in a bank for 2 years at a 3% interest rate. What is the interest you have earned after this time?

What is $300

400
Convert 3.1 to a percent
What is 310%
400

Use the percent proportion A store paid $75.29 for a couch. To make a profit, the store charged 270% of the cost. What is the price tag the store puts on the couch?

What is $203.28

400
A custom estimates a computer at an electronics store is $1099. Determine the percent of error in price if the actual price is $1349. Round to the nearest whole percent.
What is 19%.
400
Elvia can get a $10.28 discount on a $68.53 purchase at a certain department store because she works there. What percent discount does she get?
What is 15% discount.
400

Mrs. Payne has $20,000 to invest. She wants to earn $10,000 in interest. She is considering a savings and loans bank that is offering her 5.6% interest per year. For how long will she have to leave her money in the bank in order to reach her goal of $10,000?

The answer is 8.93.

500
Convert 0.07% to a decimal
What is .0007
500
Use the percent equation: John flips a quarter. It falls on tails 6 times, if this 30% of the time. How many times did he flip a quarter.
What is 20 times.
500
A student estimates the mass of an object to be 325g. The actual mass is 342g. What is the percent error of the students calculation?
What is 5%.
500
If a stereo is sold for $59.99, and Karen pays $64.19 for it when she checks out, what is the sales tax in the area?
What is 7% tax.
500

An investor places $15,000 in a savings account that pays 4.5% interest. She will leave the money there for 6 years. What will her interest be?

The answer is 4050.

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