Percent Change
When calculating percent change, if your final mathematical answer is a negative number, it indicates this type of change.
Percent decrease
When a purchase involves both a store percentage discount AND state sales tax, you must apply the sales tax to this specific amount.
The discounted price (or sale price)
In the simple interest formula I = Prt, this variable represents the annual percentage rate written as a decimal.
r (or Rate)
This type of interest is calculated on both the initial principal amount and the accumulated interest from previous periods.
Compound interest
This financial term refers to the total amount of money an employee earns before any taxes or deductions are taken out of their paycheck.
Gross pay
To convert the decimal answer from the percent change formula into a final percentage, you must multiply the decimal by this number.
100
The total amount of sales tax you will pay on a $40.00 restaurant bill if the local tax rate is 9%.
$3.60
If an investment timeline spans exactly 48 months, you would use this number for the variable $t$ in the simple interest formula.
4
If a bank account compounds interest semi-annually, this is the value you must use for n in the compound interest formula.
2
An hourly worker who earns $14.00 an hour in regular pay would earn this exact amount per hour for their overtime rate.
$21.00 per hour
The percent increase of a concert ticket that was originally $40.00 but is now sold for $50.00.
25%
The final sale price of a $120.00 pair of headphones after a 20% discount is applied.
$96.00
The total simple interest earned on a $5,000 deposit at a 3% annual rate after 6 years.
$900.00
The total number of compounding periods (the value of the exponent nt) for a loan that is compounded monthly over 10 years.
120
The total gross pay for a barista who works 38 hours in a single week at a regular rate of $15.50 per hour.
$589.00
The percent decrease if a bakery typically sells 300 bagels on a normal day, but only sells 255 on a snowy day.
15%
The final sale price of a $250.00 mountain bike after a 40% clearance discount is applied.
$150.00
The total combined amount to be repaid on a $1,500 loan after 2 years if the simple annual interest rate is 6.5%.
$1,695.00
The final balance of a $1,000 investment earning 4% interest compounded annually after 5 years.
$1,216.65
The total number of overtime hours an employee will be paid for if they clock exactly 51 hours in a standard work week.
11 hours
A rare comic book increased in value by 40%. If the original value of the book was $150.00, this is its new value.
$210.00
The final total cost of an $80.00 skateboard that is on sale for 25% off, with a 5% sales tax applied to the sale price.
$63.00
The original principal amount deposited if an account earned exactly $120.00 in simple interest over 2 years at a 5% annual rate.
$1,200.00
The total final balance of a $4,000 deposit earning 6% interest compounded monthly for 3 years.
$4,786.72
The total gross pay for a plumber working 45 hours in a single week at a standard regular rate of $24.00 per hour.
$1,140.00