If you need to calculate the percentage of a number, you should use the formula P% * X = Y where:

For example, you may need to figure out how much money you’ll save if you buy a smartphone that costs $250 with a 20% discount.

In this case, the equation will be: 20% * 250 = Y
To do the math, you should convert 20% to a decimal. Just divide the number by 100 and remove the percentage sign. You should get: 20/100 = 0.2
Change the equation: 0.2 * 250 = Y
Do the calculations: 0.2 * 250 = 50. The answer is Y = 50.

You’ll save $50 if you get a smartphone with a 20% discount.

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