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That would depend on the specific problem. The "rule of three" (i.e., solving proportions) can help for many standard problems; i.e., you consider a proportion, where the percentage has a denominator of 100. Here are some examples:1) What's 17% of 2000?
The proportion to solve is: 17/100 = x/2000
2) 500 is what percentage of 2000?
The proportion to solve is: x/100 = 500/2000
3) 500 is 10% of what number?
The proportion to solve is: 500/x = 10/100
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