Answer :

To determine the percentage value of the given number, 4.721, we need to convert it to a percentage.

1. Understanding Percentages:
By definition, 1 unit is equal to 100%. Thus, any given value can be converted to its percentage form by multiplying it by 100.

2. Conversion Step:
[tex]\[ \text{Percentage} = 4.721 \times 100 \][/tex]

3. Perform the Calculation:
[tex]\[ 4.721 \times 100 = 472.1 \][/tex]

4. Comparison with Given Options:
We are provided with the following options:
- a. 472.1%
- b. 47.21%
- c. 0.04721%
- d. 0.4721%
- e. none of the above

Our calculated percentage value is 472.1%.

Therefore, the correct answer is:
a. 472.1%