To solve the question: “8 is forty percent of what number,” simply divide the whole by the part. The result is eight. Add the other half to get the percentage. Once you know the percentage, you can try to find the number that is 40% of 20. For example, “8” is 40 percent of 20.
You can also use a calculator for calculating the percent of another number. To find out how much of a 100-dollar bill you have, multiply 40 by 5 to get 8. Likewise, forty percent of nine is twenty percent. If eight is forty percent of fifty it means that twenty percent of five equals twenty percent.