In percentage problems, three quantities are involved. We call them the "Part" the "Whole" and the "Percent"

The three formulas for solving percent problems are:
Part = Percent x Whole
Whole = Part ÷ Percent
Percent = Part ÷ Whole

You can use a Percent Wheel to help you remember these formulas.

To use a percent wheel, you place your finger over the value
you are trying to find.
The remaining segments of the percentage wheel will show you
the formula for finding that quantity.

If you need to find the percent, you place your finger over the %
symbol and you can see -

If you need to find the whole, you place your finger over the W
and you can see -

If you need to find the part, you place your finger over the P
and you can see -
You should interpret this as % x W

Part" the "Whole" and the "Percent"The three formulas for solving percent problems are:

Part = Percent x Whole

Whole = Part ÷ Percent

Percent = Part ÷ Whole

You can use a

Percent Wheelto help you remember these formulas.you are trying to find.

The remaining segments of the percentage wheel will show you

the formula for finding that quantity.

symbol and you can see -

and you can see -

and you can see -

You should interpret this as % x W

Source:

http://www.mathworks-training.com/PercentWheel.html