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is 0.9 the same as 9

Yes

No, wait, 0.09 is the same

i wanna know how you can find it

"percent" pretty much means "over 100," and 9/100=.09

You find it wit hproportions

20/100=x/45

cross multiply
20*45=100x

then solve for x
900=100x
9=x

so 9 is 20% of 45

thanks