Percentage Portion
What is 15% of 300?
x/300 = 15/100
Cross multiply
100x=4500
x=45
$1.65 is what percent of $27.50?
1.65=p% x 27.50
divide by 27.50
1.65/27.50=0.06
p%=0.06
Find the percent change from 40 hours to 50 hours.
50-40=10
10/40=0.25 or 25% increase
If you invest $1,000 at a simple interest rate of 5% per year, this is the total amount of interest you will have earned after 1 year.
$50
What is 25% off of 35?
0.25 x 35=8.75
35-8.75=26.25
0.5 is what percent of 20?
0.5/20 =0.025
0.025 x 100
2.5%
$1.48 is what percentage of $18.50?
1.48= p% x 18.50
0.08=p%
Find percent change from 20 days to 12 days.
20-12=8
8/20=0.4 or 40% decrease
You deposit $500 In your savings account. The account earns 3% simple interest per year. What is the balance after 3 years?
500(0.03)(3)=45
500+45=545
To find the price of a $80 pair of sneakers after a 25% discount.
$60
What percent of 40 is 32?
32/40 =0.8 p/100
Cross mulitply
40p=3200
p=80%
Your dinner bill shows $18.50 for the food total and $1.48 for tax.
Find the percentage of sales tax on the food
Use: A=P% x W
1.48=p% x 18.50
0.08=p%
Identify the percent of change as an increase or decrease. Then find the percent of change.
300 miles to 210 miles
decrease, 30%
You deposit $20 in a savings account count. The account earns 4% simple interest in 3 years. What is the annual interest rate?
23.20
The same pair of earring is on sale in 3 stores. Which store has the best price?
A: Regular price $45
Sale:40% off
B: Regular price: $49
Sale: 50% off
C: Regular price: $39
Sale: 20% off
Store B
3/4 is 60% of what number
Convert the numbers into decimals:
3/4=0.75 and 60/100=0.6
0.75 = 0.60x
0.75/0.60=1.25
x= 1.25
A student measures the boiling point of water to be 97.5°C. The accepted boiling point is 100°C. What is the percent error?
97.5-100/100
=2.5%
What does it mean for a quantity to change by n%?
The quantity increases or decreases by n% amount of the original amount
You borrow $600 to buy a violin. The simple annual interest rate of a loan that you pay back in 2 years. You are asked to find the local payment.
600(0.15)(2)=180
600+180=780
780/24=32.50
A boutique buys a vase for $50 and applies a 120% markup.
$110
What is 65% of 80x
Convert 65% into a decimal
65/100=0.65
Remember the word "of" means multiplication
0.65 x 80x =52x
Water tank A has a capacity of 550 gallons and is 66% full. Water tank B is 53% full. The ratio of the capacity from Tank A to tank B is of 11:15.
How much water is in each tank?
11/15 = 550/x Cross multiply
550x15=8,250
11 x X= 11x
8,250/11=750 = x <- Tank B
Tank A: 0.66 x 550=363
Tank B: 0.53 x 750=397.5
Tank A had 363 gallons and Tank B has 397.5 gallons
A company's revenue in 2024 was $150 million. In 2025, the revenue decreased by 5%. In 2026, the revenue increased by 9%. What was the overall percent increase in revenue from 2024 to 2026, rounded to the nearest tenth of a percent?
Calculate 2025 revenue:
150x(1-0.05)=142.5
Calculate 2026 revenue: 142.5x(1+0.09)=155.325
Calculate overall percentage increase:
155.325-150=5.325
5.325/150=0.0355 or 3.55%
A student takes out a $5,000 simple interest loan to buy a car at a 6% annual rate. After 4 years, what is the total amount required to pay off the loan in full?
$6,200
After applying a 20% discount to a marked-up item, the final price is exactly $100. Find the price of the item before the discount.
$125