Question

What is the percent of change? 70 mph to 55 mph

Answer 1

21.4%

Explanation:

percent of change = (new value - original value) ÷ original value

=
`((55-70))/(70)`

= -15/70

= -21.4% or a decrease of 21.4%

Answer 2

-21.4286% increase

or

= 21.4286% decrease

Explanation:

How to Calculate Percentage Increase

Subtract final value minus starting value

Divide that amount by the absolute value of the starting value

Multiply by 100 to get a percent increase

If the percentage is negative, it means there was a decrease and not an increase.

Percentage Increase Formula

You can use the percentage increase formula for any percent increase calculation:

Percentage Increase=Final Value−Starting Value|Starting Value|×100

Example Problem: Percentage Increase

Last year your favorite jeans cost $36 per pair. This year they cost $45 per pair. What is the percentage increase in the price of these jeans from last year to this year?

Percentage Increase = [ (Final Value - Starting Value) / |Starting Value| ] × 100

45 - 36 = 9

9 / 36 = 0.25

0.25 × 100 = 25%

So the price of your favorite jeans increased by 25% from last year to this year.