Show:
Percent of Change
Percent of Error
Discounts
Markups
Simple Interest
100
Find the percent of decrease from 512 to 320.
What is a 37.5% decrease?
100
Dennis wants to buy a card for his wife. Dennis calculates the amount of the card as $4.50. The actual price of card is $4. Find Dennis’s percent error.
What is 12.5% error?
100
The original price of a pair of shorts is $35. It is on sale for 25% off. What is the sale price?
What is $26.25?
100
A store pays $70 for a bicycle. The percent of markup is 20%. What is the selling price?
What is $84?
100
You put $350 in an account. The account earns $17.50 simple interest in 2.5 years. What is the annual interest rate?
What is 2%?
200
Find the new amount if $45 increases by 20%.
What is $54?
200
Elena’s math class had 24 students yesterday. She miscounted the class total and recorded it as 20 students. Find Elena’s percent error. Round to the nearest tenth.
What is 16.7% error?
200
The original price of a sweater is $60 and the sale price is $45. Find the discount rate.
What is 25% off?
200
A store pays $75 for an aquarium. The markup is 25%. Find the selling price.
What is $93.75?
200
You borrow $600 to buy a violin. The simple interest rate is 15%. You pay off the loan after 5 years. Find the total amount you pay for the loan.
What is $1050?
300
In 1991, the price of a hot dog at a Texas baseball stadium was $1.25. In 2001, the price of a hot dog at the stadium was $2.25. By what percent did the price change from 1991 to 2001? (Be Specific)
What is an 80% increase?
300
Jillian calculates that see will take 95 minutes to run 7 miles. She runs the distance in 80 minutes. Find Jillian’s percent error. Don't round!
What is 18.75% error?
300
A sale price of a pair of shoes is $33. It was on sale for 40% off. Find the original price of the shoes.
What is $55?
300
The tickets to a museum were marked up 35% to $59.40. Find the original price of the tickets.
What is $44?
300
You deposit $2000 in an account. The account earns $120 simple interest in 8 months. What is the annual interest rate?
What is 9%?
400
An investor buys 500 shares of a stock at a price of $24 per share. Three years later the value of each share has increased by 15%. What is the total value of the 500 shares of the stock?
What is $13,800?
400
A cereal company fills boxes with 16 ounces of cereal. The acceptable percent error in filling a box is 2.5%. Find the least and greatest acceptable weights.
What is 15.6 oz and 16.4 oz?
400
You are shopping for a cell phone. Best Buy is selling your favorite type of phone for $150 with a 40% discount. Staples is selling the same phone for $135 with a 35% discount. Which store offers the better deal and by how much?
What is Staples by $2.25?
400
You are shopping for a video game system. Walmart sells the game you want for $162 with a 40% markup rate. Best Buy sells the game you want for $155 with a 30% markup rate. At which store should you buy the system and how much would you be paying at that store?
What is Best Buy for $201.50?
400
You have two loans, for 2 years each. The total interest for the two loans is $138. On the first loan, you pay 7.5% simple interest on a principal of $800. On the second loan, you pay 3% simple interest. Find the principal for the second loan.
What is $300?
500
The number of people between the ages of 2 and 18 who accessed streaming media on the Internet in November 1999 increased by 65% to about 7 million in November 2000. About how many people in this age group accessed streaming media in November 1999? Round to the nearest tenth.
What is about 4.2 million people?
500
You estimate that 210 people attended a school concert. The actual attendance was 240 people. Find the percent error and another estimate that would give the same percent error?
What is 12.5% error and an estimate of 270 people?
500
You buy a bicycle helmet for $22.26, which includes 6% sales tax. The helmet is discounted 30% off the selling price. Find the original price.
What is $30?
500
You are buying shoes online. The selling price is $30. The sales tax is 6.5% and the cost of shipping is 15% of the total cost. Find the total cost of the shoes plus shipping. Round to the nearest cent.
What is $36.74?
500
You put $500 in an account that earns 4% annual interest. The interest earned each year is added to the principal to create a new principal. Find the total amount in your account after each year for 3 years.
What is $562.43?