Can someone explain to me how to do this problem? It is telling me the correct answer is 8505/µL, but I don't know how to get to that answer.

The following results are obtained for a patient:
Total WBC count: 15,930/µL
Nucleated red blood cells: 18

Differential:
Neutrophils 63%
Lymphocytes 14%
Monocytes 10%
Eosinophils 12%
Basophils 1%

What is the absolute neutrophil count?