Percents and Proportions Review

What is commission?

• a percentage taken off a price, or a reduction in price

• money charged on sales based on a percent of the price

• a ratio that compares a measurement to 1

• the amount of money paid to an employee for selling something

What is percent change?

• a percentage taken off a price, or a reduction in price

• money charged on sales based on a percent of the price

• a measurement that compares an old value to a new value

• a measurement that compares an estimate to an exact value

What is a proportion?

• a ratio that compares a measurement to 1

• money given to someone for a service

• quantity out of 100

• two equal ratios

What is a tip?

• quantity out of 100

• interest calculated on the principal

• money given to someone for a service

• the amount of money paid to an employee for selling something

What is percent error?

• a measurement that compares an old value to a new value

• a measurement that compares an estimate to an exact value

• quantity out of 100

• two equal ratios

What is the formula for simple interest?

• T = irp

• I = mrt

• I = prt

• I = pst

How do you convert a percent to a decimal?

• multiply by 100

• add 100 to each side

• divide by 10

• divide by 100

How do you convert a fraction to a decimal?

• divide the denominator by the numerator

• multiply by 100

• divide the numerator by the denominator

• divide by 100

What is the formula for percent error?

• $\frac{difference}{old\ value}\ x\ 100$

• $\frac{difference}{exact\ value\ }\ x\ 100$

• $\frac{old\ value}{new\ value}\ x\ 100$

• $\frac{estimated\ value}{exact\ value}\ x\ 100$

What is the formula for percent change?

• $\frac{new\ value}{old\ value}\ x\ 100$

• $\frac{old\ value}{new\ value}\ x\ 100$

• $\frac{original}{change\ }\ x\ 100$

• $\frac{change}{orginial\ }\ x\ 100$