Percent Increase
A jacket costs $50. The sales tax is 6%. What is the total cost after tax?
50 x 1.06 = 53
The total cost is $53
A pair of shoes is $80. They are on sale for 25% off. What is the sale price?
80 x 0.25 = 20
80 - 20 = 60
The sale price is $60
What is the formula to determine percent error?
Percent Error = (measured / actual) x 100%
15 is what percent of 75?
15 / 75 = 0.2 = 20%
Maine
A student’s score improves from 60 to 75. What is the percent increase?
The score increased by 15 points
15 / 60 = 0.25
The percent increase was 25%
A shirt price goes from $20 to $18. What is the percent decrease?
20 - 18 = 2
2 / 20 = 0.1 = 10%
The percent decrease is 10%
The actual distance is 100 meters, but it was measured as 110 meters. What is the percent error?
110 / 100 = 1.10 = 110%
There is a 10% error
120 x 0.6 = 72 girls. -> 120 - 72 = 48 boys
OR
60% girls means 40% boys -> 0.4 x 120 = 48 boys
What is the smallest bone in the human body?
The stapes, measured approximately 2-3mm in length, located in the middle ear
A backpack costs $40. There is an 8% sales tax. How much tax is added?
8% of 40 = 0.08 x 40 = 3.2
The tax added is $3.20
A t-shirt was on sale for 20% off. Write an equation to represent the sale price, s, of the t-shirt, compared to the original price, p.
s = (1 - 0.2)p
s = 0.8p
s = 1p - 0.2p
A scale shows the mass of an object as 52 g, but the true mass is 50 g.
Find the percent error.
Percent Error = (52 / 50) x 100% =1.04 x 100%
= 104%
The percent error is 4%
A town’s population grew from 24,000 people to 30,000 people.
Find the percent increase.
The population increased by 6000 (30000 - 24000 = 6000)
6000 / 24000 = 0.25 = 25%
The increase was 25%
In 1518, dozens of people in France started dancing non-stop until they collapsed or died. What was this event called?
The Dancing Plague
A dinner bill is $80. You leave a 25% tip. What is the total cost including tip?
25% of 80 = 0.25 x 80 = 20
80 + 20 = 100
The total cost including tip is $100
The price of a bicycle was reduced from $450 to $360.
Find the percent decrease.
450 - 360 = 90
90 / 450 = 0.2 = 20%
OR
360 / 450 = 0.8 = 80%
100% - 80% = 20%
DOUBLE POINTS!
A thermometer reads 96°F, but the actual temperature is 100°F.
Find the percent error.
Percent Error = (96 / 100) x 100% = 0.96 x 100%
= 96%
There is a 4% error
A jacket at a store originally costs $80. During a sale, the store offers a 25% discount. After the discount is applied, a 6% sales tax is added to the reduced price.What is the final price of the jacket after the discount and tax are applied?
Step 1: Apply the 25% discount (percent decrease)
25% of 80 = 0.25 × 80 = 20
Discounted price = 80 − 20 = $60
Step 2: Apply the 6% sales tax (percent increase)
6% of 60 = 0.06 × 60 = 3.60
Final price = 60 + 3.60 = $63.60
What is the only food that doesn't expire?
Honey
The population of a local town has increased by 20% since last year. Write an equation to represent the population, P, this year.
P = 1.20x
P = 1x + 0.2x
P = (1 + 0.2)x
Ashley and her friend went to the movies and used a 5% off coupon for their movie tickets. Write an equation to represent the new price, n compared to the original price, p.
s = 0.95p
A student calculates the speed of a car to be 72 mph, but the actual speed is 80 mph.
Find the percent error.
Percent error = (72 / 80) x 100% = 0.9 x 100% =
90%
There is a 10% error.
You go out to eat at a restaurant and your meal costs $48.50. The sales tax rate is 6%, and you decide to leave a 20% tip based on the pre-tax amount. Determine the tax, tip, and the total amount paid.
You will pay $2.91 in tax, $9.70 in tip, and a total of $61.11
What is the national animal of Scotland?
The unicorn