Convert 28% into the form of ratio.

The correct option is 7 : 25.

To convert a percentage into a ratio, follow these step-by-step instructions:

Step 1: Write the given percentage as a fraction.
A percentage represents a fraction with a denominator of 100. Therefore, 28% can be expressed as:

$\frac{28}{100}$

Step 2: Simplify the fraction to its lowest terms.
Find the greatest common divisor (GCD) of the numerator 28 and the denominator 100, which is 4. Divide both the numerator and the denominator by 4:

$\frac{28÷4}{100÷4}=\frac{7}{25}$

Step 3: Convert the fraction into ratio form.
A fraction in the form $\frac{\mathrm{a}}{\mathrm{b}}$ is written in ratio form as $\mathrm{a}:\mathrm{b}$.

Thus, $\frac{7}{25}$ in ratio form is 7 : 25.