9. After Mother's Day this year, the loungewear department had customer returns of 10.5%. The department's net sales amounted to $635,380. As the buyer reviewed last year's figures for the same period, the customer returns were 12.5%, with gross sales of $726,149. (a) Compute the department's performance in dollars and percentages for this year and last year, in regard to gross sales, customer returns, and net sales. (b) Compare this year's results to last year's performance. Discuss the performance from a profit viewpoint.