Definitions/Formulas
How do you go from a decimal to a percent?
Multiply by 100
Move the decimal to the right twice
Find 15% of 70
10.5
You spend $10 on a meal. You tip 20% and have to pay a 4% sales tax. How much money do you spend?
$12.40
You start at 5 and grow to 8. What is the percent change, and is it an increase or a decrease?
60% increase
How do you go from a percent to a decimal?
Divide by 100
Move the decimal to the left twice
Find 200% of 5
10
You deposit $2000 in to a savings account that earns 5% interest per year. How much money is in your bank account after 6 years?
$2600
A classroom grows from 20 students to 30 students. What is the % change? Is it an increase or a decrease?
What is the formula (equation) for percent change?
amount of change/original amount x 100
You start a club with 28 members. Over a year, your group grows by 50%. How many members are there now?
42
Joe borrowed $2000 from the bank at a rate of 7% simple interest per year. How much interest would Joe pay in 5 years?
$700
The average score on a test drops from 90 points to 45 points. What is the % change? Is it an increase or a decrease?
50% decrease
What is the "Principal"?
The original amount of money borrowed or deposited
Your Spotify playlist started at 810 songs and grew by 130%. How many songs are now in your playlist?
You have $550 in a savings account that earns 3% simple interest every year, how much money will be in your account in 10 years?
$715
A coffee shop starts the day with 16 bagels and ends the day with 0 bagels. What is the percent change. Is it an increase or decrease?
100% decrease
What is simple interest?
A fixed percent of the principal
Your stocks started at a value of $29,000. Your stocks suffered a 4% drop in value one day. How much are they worth now?
$27,840
James makes $7 an hour. Priya makes 20% more than James. Siobhan makes 5% less than Priya. How much money does Siobhan make per hour?
$7.98/hr
Describe the process of calculating percent change
Up to Mr. Williams's discretion