Percent Change HML p. 388 Ch. 7

Front

What is percent change?

Back

Percent change is a way to express how much a quantity has increased or decreased relative to its original amount, calculated as (New Value - Original Value) / Original Value x 100%.

Front

How do you find what number a percentage is of?

Back

To find what number a percentage is of, use the formula: Part = Percent x Whole. Rearranging gives Whole = Part / Percent.

Front

What is the formula to calculate the percent of change?

Back

Percent of Change = (New Value - Original Value) / Original Value x 100%.

Front

If 80 is 125% of what number, how do you find that number?

Back

To find the number, use the formula: Number = Part / Percent. Here, Number = 80 / 1.25 = 64.

Front

What is 4.5 as a percentage of what number?

Back

To find the number, use the formula: Number = Part / Percent. Here, Number = 4.5 / 0.009 = 500.

Front

How do you determine if there is an increase or decrease in percent change?

Back

If the new value is greater than the original value, it is an increase. If the new value is less, it is a decrease.

Front

Calculate the percent change from 50 to 55.

Back

Percent Change = (55 - 50) / 50 x 100% = 10% increase.

Front

What is 78% of 370?

Back

To find this, multiply 370 by 0.78. 370 x 0.78 = 288.6.

Front

How do you calculate sales tax?

Back

Sales Tax = Price x Tax Rate. For example, if the meal is $12 and tax is 6.5%, then Sales Tax = 12 x 0.065 = $0.78.

Front

How do you calculate a tip?

Back

Tip = Meal Cost x Tip Rate. For example, if the meal is $12 and the tip is 15%, then Tip = 12 x 0.15 = $1.80.