What percentage of 40 is equal to 8?

• A. 15%
• B. 20%
• C. 25%
• D. 30%

Answer: (B)

To find what percentage of 40 is equal to 8, you can use the formula for percentage, which is:

[

\text{Percentage} = \left(\frac{\text{part}}{\text{whole}}\right) \times 100

]

In this situation, the "part" is 8, and the "whole" is 40. Plugging these values into the formula gives:

[

\text{Percentage} = \left(\frac{8}{40}\right) \times 100

]

Next, simplify (\frac{8}{40}):

[

\frac{8}{40} = 0.2

]

Now, multiplying by 100 to convert the decimal to a percentage:

[

0.2 \times 100 = 20%

]

This calculation shows that 8 is 20% of 40, confirming that the correct answer is indeed 20%. The understanding of this calculation illustrates the relationship between parts and wholes when determining percentages, thereby reinforcing key arithmetic concepts beneficial for solving similar problems in mathematics.