Could you plz explain this question 53 for me?

Abound Company has two support departments (S1 and S2) and two producing departments (X and Y). Department S1 serves Departments S2, X, and Y in the following percentages, respectively: 10%, 35%, 55%. Department S2 serves Departments S1, X, and Y in the following percentages, respectively: 6%, 50%, and 44%. Direct department costs for S1, S2, X, and Y are $15,000, $8,000, $105,000, and $97, 500, respectively. What are the total costs to be allocated from Department S2? $8,000 $9, 557 $900 $15, 573