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YSK - X percent of Y is equal to Y percent of X. So, if you want to find out what 7% of 50 is, you could instead find out what 50% of 7 is, which is 3.5. This means that 7% of 50 is also equal to 3.5.
I don't see how that explanation makes sense. It's not showing the same thing.
The example in the title is saying .50 times 7 is equal to .07 times 50 which is not just changing the order like in your explanation.