Final answer:
Total operating income for Ford Company would increase by $600,000, Division A's operating income would increase by $300,000, and Division B's operating income would also increase by $300,000. The range of acceptable transfer prices is $20.01 to $29.99 per unit.
Step-by-step explanation:
Calculation of Increase in Operating Income
If Division A purchases the materials from Division B at a transfer price of $25 per unit instead of $30 from an external supplier, Division A saves $5 per unit (difference between external price and internal transfer price). For the transfer of 60,000 units, the total savings for Division A would be 60,000 units × $5/unit, which equates to a $300,000 increase in operating income for Division A.
On the other hand, Division B's variable cost is $20 per unit and the transfer price is $25 per unit, this provides Division B with a profit of $5 per unit. Thus, Division B's increase in operating income would be 60,000 units × $5/unit, which results in a $300,000 increase for Division B.
For Ford Company as a whole, since there are no reductions in Division B's sales, the increase in total operating income is the sum of the increases of both divisions, which is a $600,000 increase in total operating income.
Regarding the range of acceptable transfer prices using the negotiated price approach, any price above Division B's variable cost of $20 per unit and below Division A's external purchase price of $30 per unit would be acceptable. Therefore, the range of acceptable transfer prices is $20.01 to $29.99, ensuring both divisions benefit from the internal transfer.