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How To Calculate Percentage Decrease
How to calculate percentage decrease (with two examples)
A percent decrease is computed when a quantity grows smaller. To calculate the percentage decrease you should use the basic formula below:
Percent decrease = (Original Amount – New Amount)
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Original Amount
For example:
Last week, there were 400 people who attended church. This week, 200 people attended church. What is the percentage decrease? First, you find the difference between the two numbers (400 – 200 = 200) to find how much the total decrease is. Then you divide the number you come with by the original amount (200/400 = .5). The final step is to move the decimal to the right two places to get the number in percentage form. Thus, the final answer is a 50 percent decrease in church attendance.
Another example:
Yesterday, there were 10 cookies in the cookie jar. Today, only 3 cookies remain in the jar. What is the percentage decrease?
Step 1: 10 – 3 = 7
Step 2: 7/10 = .7
Step 3: Move the decimal to the right two places to get a percentage decrease of 70%.

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