Convert:
1.`4/5` into apercentage
2. `7/4` into a percentage
3. `45%`into a fraction
4. 105% into a fraction
5. `15%` as a ratio
6. `12:25 into a percentage

Answer

### Step-by-Step Solutions:

1. **Convert `4/5` into a percentage:**
- To convert a fraction to a percentage, multiply the fraction by 100.
- Calculation:
\[ \frac{4}{5} \times 100 = \frac{4 \times 100}{5} = \frac{400}{5} = 80 \]
- Therefore, \( \frac{4}{5} = 80\% \).

2. **Convert `7/4` into a percentage:**
- Again, multiply the fraction by 100.
- Calculation:
\[ \frac{7}{4} \times 100 = \frac{7 \times 100}{4} = \frac{700}{4} = 175 \]
- Therefore, \( \frac{7}{4} = 175\% \).

3. **Convert `45%` into a fraction:**
- To convert a percentage to a fraction, write it over 100.
- Calculation:
\[ 45\% = \frac{45}{100} \]
- Simplifying the fraction:
\[ \frac{45 \div 5}{100 \div 5} = \frac{9}{20} \]
- Therefore, \( 45\% = \frac{9}{20} \).

4. **Convert `105%` into a fraction:**
- Write the percentage over 100.
- Calculation:
\[ 105\% = \frac{105}{100} \]
- Simplifying the fraction:
\[ \frac{105 \div 5}{100 \div 5} = \frac{21}{20} \]
- Therefore, \( 105\% = \frac{21}{20} \).

5. **Convert `15%` as a ratio:**
- First, convert the percentage into a fraction:
\[ 15\% = \frac{15}{100} \]
- Simplifying the fraction:
\[ \frac{15 \div 5}{100 \div 5} = \frac{3}{20} \]
- The ratio of 15% can be expressed as \( 3:20 \).

6. **Convert `12:25` into a percentage:**
- To convert a ratio into a percentage, divide the first number by the second and multiply by 100.
- Calculation:
\[ \frac{12}{25} \times 100 = \frac{12 \times 100}{25} = \frac{1200}{25} = 48 \]
- Therefore, \( 12:25 = 48\% \).