Percent Basics
Convert 0.375 to a percent
37.5%
A shirt costs $40.00 and is on sale for 25% off. What is the sale price?
$30.00
Increase 50.0 → 65.0. Percent increase?
30%
18 out of 28 students are female. Percent female (one decimal).
64.3%
15% of 220.0?
33
Convert 0.35 to a percent
35%
Sales tax of 7.5% is added to a purchase of $86.00. What is the total cost including the tax?
$92.45
120.00 → 90.00. Percent decrease?
25%
64% of 250 people prefer option A. How many?
160 people
Increase by 12% then decrease by 12%. Does it return to original? Show with 100.0
No. Final = 98.56 (1.44% decrease)
Convert 0.16666... to a percent rounded to 2 decimal places
16.67%
$1,200 at 4% interest each year for 3 years (compound). Final amount?
$1,349.84
2500.00 → 2000.00 in one year. Percent change?
20%
{12.0, 15.0, 18.0, 21.0, 24.0}.
What percent of the numbers are greater than 15.0?
60%
30% tip on $68.40 split among 4. Each pays?
$5.13 each
250.0 g is 62.5% of the total. What is the total?
400 g
Buy two $65.00 items; second is 40% off. Total cost?
$104.00
12,000.0 → 15,600.0 in 4 years. Total percent increase and average annual percent
7.5%
3 out of 25 items defective. Percent and per 1000 items?
12%, 120 out of 1000
Final price after 15% and 20% discounts is $85.10. Original price?
$114.75
Explain why multiplying a decimal by 100 converts it to a percent.
Multiplying a decimal by 100 shifts the decimal point 2 places to the right.
A population of bacteria grows by 18% every hour. If the original population is 400 people, What would the population be after 1 hour?
472
Start $1,000. Apply +20%, then −15%, then +10%. Final value and overall percent change?
$1,122; overall, 12.2% increase
A class has 30 students. 23% are in group X. How many students are in group X? Round to the nearest whole number.
7 students
Revenue $500,000 grows 6% for 3 years, then falls 8% for 2 years. Revenue after 5 years and net percent change?
$503.943, 0.79% increase.