Answer :

To solve for the base when given that 23 is 0.25% of some number, follow these steps:

1. Identify the key components:
- The value you have is 23.
- The percentage given is 0.25%.

2. Convert the percentage to decimal form:
- To convert 0.25% to decimal form, divide by 100:
[tex]\[ 0.25\% = \frac{0.25}{100} = 0.0025 \][/tex]

3. Set up the equation:
- Use the formula for finding the base from a percentage:
[tex]\[ \text{value} = \text{percentage} \times \text{base} \][/tex]
- Substituting the known values:
[tex]\[ 23 = 0.0025 \times \text{base} \][/tex]

4. Solve for the base:
- To isolate the base, divide both sides of the equation by 0.0025:
[tex]\[ \text{base} = \frac{23}{0.0025} \][/tex]

5. Calculate the base:
- Perform the division:
[tex]\[ \text{base} = 9200 \][/tex]

Therefore, 23 is 0.25% of 9200. The base is 9200.