Final answer:
The average rate of return on the equipment is 16.15%
Step-by-step explanation:
To determine the average rate of return on the equipment, we can use the formula: (Annual Cash Inflows - Annual Cash Outflows) / Initial Investment cost. In this case, the annual cash inflows are the additional annual sales of the smartphone, which is 4,900 units at $198 per unit.
So the annual cash inflows are 4900 x $198 = $970,200. The annual cash outflows include the direct labor, direct materials, and factory overhead costs per unit, which sum up to $180 per unit.
So the annual cash outflows are 4900 x $180 = $882,000.
Now, let's calculate the average rate of return: (970,200 - 882,000) / 546,800 = 0.1615 (rounded to four decimal places). Multiply this by 100 to convert to a percentage: 0.1615 x 100 = 16.15%.