Discussion:
You want to compare differences in sales dollars (DV) for 43 employees before and after they have attended a motivational seminar.
Since comparing differences is the goal, I presume that you are going to compare the means of a pre-post test of the 43 employees. Okay, I was going to say that this is the answer but lets be honest, I feel that I am guessing, so I am thinking it is a McNemar test because you are doing a before-after measurement of the same subjects.
At the same time, because you are doing a before and after test of the same subjects you are one could also use the t-test for two-related-samples tests because the events are closely matched.