Final answer:
The rate of commission for the tractor salesman is 6.99%.
Step-by-step explanation:
To find the rate of commission, divide the total commission received by the total sales amount. In this case, the total commission received is $2704.94, and the total sales amount is $38,642. Dividing $2704.94 by $38,642 gives a rate of approximately 0.0699. This means the commission rate is 6.99%.