1. **State the problem:** We need to find a linear model for the total monthly salary $T$ of a sales executive who earns a base salary plus a commission based on sales $s$. 2. **Identify the components:** The base salary is 6000 dollars per month. 3. **Commission:** The commission is 4% of total sales $s$, which can be written as $0.04s$. 4. **Form the linear model:** Total salary $T$ is the sum of base salary and commission: $$T = 6000 + 0.04s$$ 5. **Calculate the salary for $s = 80000$:** Substitute $s = 80000$ into the model: $$T = 6000 + 0.04 \times 80000$$ $$T = 6000 + 3200 = 9200$$ 6. **Interpretation:** The executive will earn 9200 dollars in a month with sales of 80000 dollars.