Is the value of the new amount greater than or less than the value of the original amount?
Decrease, 30 %
Practice makes perfect
We want to tell whether each percent change is an increase or decrease. Then, we want to find the percent change. Let's do it one at a time.
Percent Increase or Percent Decrease
Recall that if a new amount is greater than the original amount, the percent change is called a percent increase. If the new amount is less than the original amount, the percent change is called a percent decrease. Consider the given amounts.
Original Amount:&300 mi
New Amount:&210 miWe can see that the new amount is less than the original amount, so the percent change is a decrease.
Finding the Percent Change
To determine the percent change p, we can use the following general formula.
p % =Amount of change/Original amount
From the given values, we can see the original amount was 300 and the new amount is 210. This is a decrease in the amount. Let's find the amount of decrease.
300- 210= 90
The difference between the original amount and the new amount is 90. Now we can use the formula.
Percent of change=Amount of decrease/Original amount
