What is 30 percent of 40? Here we will tell you what 30 percent of 40 (30% of 40) is and then show you how we calculated it. The answer to "What is 30 percent of 40?" is:

12

30 percent of 40 is the same as 30 per hundred of 40. We can therefore make the following equation:

30/100 = X/40

To solve the equation above for X, you first switch the sides to get the X on the left side, then you multiply each side by 40, and then finally divide the numerator by the denominator on the right side to get the answer. Here is the work to illustrate:

30/100 = X/40
X/40 = 30/100
X*40/40 = 30*40/100
X = 1200/100
X = 12

The work above shows the long way to explain how to calculate 30 percent of 40 in order to give you a foundation and better understanding of how to calculate percentage. In the future, you could use this simplified formula:

(Y * P)/100

In our problem "What is 30 percent of 40?", Y is 40 and P is 30:

(40 * 30)/100 = 12

And once again you see that the answer is 12.

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