So lets say this. You have 25 red b***s, out of 50. As a percent this would be 50% of 50, because 25 = 50%(half) of 50.
Percents as decimals are like this:
75% as a decimal, move the decimal place 2 times to the left to get the decimal. (75.0% -> 7.50% -> 0.75%) Then take away the percetn(%) sign to get your answer: 0.75 as a percent is 75%.