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**Hint:**To calculate the percentage of something we have to follow below instructions.

1. Determine the total or whole amount.

2. Divide the number to be expressed as a percent by the total. In most cases, you'll divide the smaller number by the larger number.

3. Multiple the resulting value by 100.

We already studied in school that x% of y is written as following equation

\[ \Rightarrow x\% \times y = \dfrac{x}{{100}} \times y\]

We apply the above mentioned equation in this problem by replacing values of variables with values in the question.

**Complete step-by-step solution:**

Here we consider value of x =8

Value of y =25

8% of 25

\[ = 8 \times \dfrac{{25}}{{100}} \\

= \dfrac{{8 \times 25}}{{100}} \\

= \dfrac{{200}}{{100}} \\

= 2 \]

**Hence the value of 8% of 25 kg is 2kg**

**Note:**Generally, in word percent per means each and cent means 100. The word percent means for every 100th part. Here in our question 8% of 25 kg means if 25 kg is considered as 100 parts, it is asked to find what will be the value of 8 parts amongst 100 parts of 25 kg?

The answer we got from the calculation is 2kg.

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