A real estate agent works on a $4 \%$ commission. What is her commission on a house that she sold for $\$ 135,000$ ? Follow the problem-solving process and round your answer to the nearest cent, if necessary.

Step 1 ：A real estate agent works on a 4% commission. She sold a house for $135,000. We need to find out her commission.

Step 2 ：The commission is calculated as a percentage of the total price of the house. In this case, the commission is 4% of $135,000.

Step 3 ：We can calculate this by multiplying 135,000 by 0.04 (which is the decimal equivalent of 4%). In mathematical expression, it can be represented as \(135000 \times 0.04\).

Step 4 ：After calculating the above expression, we find that the commission is $5400.0.

Step 5 ：Final Answer: The commission on a house that she sold for $135,000 is \(\boxed{5400}\).