The image asks to evaluate the expression:

$\left( \frac{3}{5} - \frac{1}{5} \right) \div \frac{1}{4} - \frac{1}{2}$

Let's proceed to solve this step by step:

1. First, evaluate inside the parentheses: $\frac{3}{5} - \frac{1}{5} = \frac{2}{5}$

2. Then, divide this result by $\frac{1}{4}$: $\frac{2}{5} \div \frac{1}{4} = \frac{2}{5} \times \frac{4}{1} = \frac{8}{5}$

3. Now subtract $\frac{1}{2}$ from this result: $\frac{8}{5} - \frac{1}{2}$

   To subtract, we need a common denominator: $\frac{8}{5} = \frac{16}{10}, \quad \frac{1}{2} = \frac{5}{10}$

   So, $\frac{16}{10} - \frac{5}{10} = \frac{11}{10}$

Thus, the final result is $\frac{11}{10}$ or 1.1.

Do you need more details or have any questions?

Here are some related questions for further practice:

1. How do you divide two fractions in general?
2. What is the process for finding a common denominator?
3. How can we convert an improper fraction to a decimal?
4. What are some other methods for simplifying expressions with fractions?
5. How would this expression change if it were multiplication instead of division?

Tip: When dividing fractions, always multiply by the reciprocal of the divisor.