What is 20% of 40?

Always use this formula to find a percentage:

% / 100 = Part / Whole

replace the given values:

20 / 100 = Part / 40

Cross multiply:

20 x 40 = 100 x Part, or

800 = 100 x Part

Now, divide by 100 and get the answer:

Part = 800 / 100 = 8

Similar question could be: 20 is what percent of 40?

Use again the same percentage formula:

% / 100 = Part / Whole replace the given values:

% / 100 = 20 / 40

Cross multiply:

% x 40 = 20 x 100

Divide by 40 and get the percentage:

% = 20 x 100 / 40 = 50%