11.11%
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1/5 of 45 is nine.
Forty-Five is what percent of Eighty-One?45 is 55 and 1/5% of 81.Just use this simple formula to figure out every problem like this one!FORMULA: is/of = %/100.
1/5 of 40 = 8
20%
45 divided by 1/5 is 225.