Astadium has direct staffing costs of $108,000. overhead costs (social security, medicare, worker's compensation, etc.) cost the stadium an additional 15%. what is the total staffing cost?

Is the overhead costs an additional 15% of the staffing cost? The question doesn't imply that, but if it does. We have 15/100 * 108, 000 = $16200. So the total staffing cost is $108, 000 + $16200 = $124, 200. If it's not 15% of the staffing cost, then the question must be incomplete.