Final answer:
The salesperson's total income is $27,000, including a fixed salary of $12,000 and a commission of $15,000 based on 5% of the sales amount.
Step-by-step explanation:
To calculate the salesperson's total income, we need to consider their fixed salary and commission. The fixed salary is $12,000 per year. The commission is 5% of the sales amount. In this case, the sales amount is $300,000. To find the commission, we multiply $300,000 by 5% (0.05), which gives us $15,000. Adding the fixed salary and commission together, the salesperson's total income is $12,000 + $15,000 = $27,000.