If 10,000% of a penney is $1 why do u change the 10,000% to 100?

Question

I asked the question: what is 10,000% of a penney and how to figure it? I got answer of 10,000%=100       100/ .01 = $1     

New question is how do u know to change the 10,000% to 100?

Answer 1

yu gotta konvert % tu sumthun yukan yuze in a equashun

so yu chaenj it tu a number

eezeeest tu chaenj it tu desimal number