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It would leave four-fifths of the original number.

Q: What would a decrease of 20 percent be for a certain number?

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Well it depends on what you are trying to describe it as a percent of. If you are trying to find out what percent of 619 is of 100, the answer is 619%. If you are trying to figure out what 619 percent of 1000 is the answer would be 61.9 percent. If you are trying to find out what percent it is of a certain number you would do 6.19 multiplied by the number.

A - A x 1 / 100 = Xwhere 'A' is the number and 'X' is the result of decreasing by 1% from A.Example: To decrease 1% from 20 you would calculate as20 - 20 x 1 / 100 = 19.8

the bears would decrease because bears eat salmon

900 is 75% of 1200 so the percentage decrease would equal 25%

decrease

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You can put the percent number over 100 and multiply it by the number you want to decrease, like 9% decrease from 100 would be 9/100 times 100... If you have a calculator, you can move the decimal place over to the right twice, and mulitply. So 9% would be 0.09.

That would be decrease

Well it depends on what you are trying to describe it as a percent of. If you are trying to find out what percent of 619 is of 100, the answer is 619%. If you are trying to figure out what 619 percent of 1000 is the answer would be 61.9 percent. If you are trying to find out what percent it is of a certain number you would do 6.19 multiplied by the number.

a decrease of 37.87%

A - A x 1 / 100 = Xwhere 'A' is the number and 'X' is the result of decreasing by 1% from A.Example: To decrease 1% from 20 you would calculate as20 - 20 x 1 / 100 = 19.8

the bears would decrease because bears eat salmon

900 is 75% of 1200 so the percentage decrease would equal 25%

0.82

If the number of phytoplankton decrease the food chain would decrease in the ocean.

decrease

The number of first level consumers would decrease causing the second level to also decrease and so on up the food chain.

To find out what percentage of a number a certain number is, divide it by x/100. In this instance, 63 / (70/100) = 90.This is the opposite of what you would do if you were given the total, and told to find a certain percentage.