Nantua Corporation has two divisions: Southern & Northern. The following information is from last year's income statement segmented by divisions: Sales Total Company $4800000, Southern $2980000 Northern $1820000. Contribution margin: Total $2050000, Southern $1290000, Northern $760000 Divisional Segment margin total $1090000, southern $860000, northern $230000. Net operating income for Nantua Corporation was $480000. In last year's income statement segmented by division, what were Nantua's total common fixed expenses? a) $610000 b) $960000 c0 $1570000 d) $1700000