What is the formula for finding percentages?

Question

I'm taking the GED test in an hour and I forget how to do percentages.

Answer 1

very unspecific question.

but a number times 100% equals to that number in %

for example 0.5 = 50%

0.5 times 100% = 50%

Answer 2

if you have a decimal you move the decimal over 2 times to the right

ex: .5 = 50%