We already have our first value **40** and the second value **8**. Let's assume the unknown value is **Y** which answer we will find out.

As we have all the required values we need, Now we can put them in a simple mathematical formula as below:

STEP 1 Y = 840

By multiplying both numerator and denominator by 100 we will get:

STEP 2 Y = 840 × 100100 = 20100

STEP 3 Y = 20

Finally, we have found the value of Y which is 20 and that is our answer.

You can use a calculator to find **what percent of 40 is 8**, just enter **8 ÷ 40 × 100** and you will get your answer which is **20**

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Here is a calculator to solve percentage calculations such as what percent of 40 is 8. You can solve this type of calculation with your values by entering them into the calculator's fields, and click *'Calculate'* to get the result and explanation.

Let's solve the equation for Y by first rewriting it as: **100% / 40 = Y% / 8**

Drop the percentage marks to simplify your calculations: **100 / 40 = Y / 8**

Multiply both sides by 8 to isolate Y on the right side of the equation: **8 ( 100 / 40 ) = Y**

Computing the left side, we get: **20 = Y**

This leaves us with our final answer: **20 percent of 40 is 8**