Combined reporting of overall net income by parent company and its unitary affiliates was necessary where parent designed and developed programs for implementation by its affiliates and directed the affiliates' day-to-day operations.
Taxpayer did not use its investment account in its regular trade or business so its investment income was not business income. Reimbursement of shared business expenses from a co-tenant was business income.
Taxpayer not allowed research and development credit, under A.R.S. 43-1168, where the Taxpayer relies on unsubstantiated estimates of research expenditures from an acquired company in years preceding the acquisition of such company to calculate the credit.