Average Rate of Return (I don't understand this question! Please help!)

Average Rate of Return New Product Pocket Pilot Inc. is considering an investment in new equipment that will be used to manufacture a mobile communications device. The device is expected to generate additional annual sales of 4,300 units at $274.00 per unit. The equipment has a cost of $439,900, residual value of $33,100, and an eight-year life. The equipment can only be used to manufacture the device. The cost to manufacture the device is shown below. Cost per unit: $46.00 Direct labor 178.00 Direct materials 29.65 Factory overhead (including depreciation) $253.65 Total cost per unit Determine the average rate of return on the equipment. If required, round to the nearest whole percent