is the same as writing 3/25 when writing it out on a computer keyboard.
Use long division or a calculator to find that 3/25 = 0.12 exactly without any rounding done to it.
Then move the decimal point two spots to the right. It will turn 0.12 into 12%
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Another approach: Multiply top and bottom of 3/25 by 4 to get 12/100. That leads to 12% because "percent" means "per 100".
As another example, 78/100 means 78%.
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Answer: 12%