Determining amounts to be paid on invoices

$\backslash$table$[[,\backslash$table$[[$Merchandise$],[$Invoice Amount$]],\backslash$table$[[$Freight$],[$Paid by Seller$]],,\backslash$table$[[$Customer Returns$],[$and Allowances$]]],[$a$.,$$$32,000,-,$FOB destination, $\frac{n}{30},$$$1,600$