ABC Company has two products: A and B. The company uses activity-based costing. The estimated total cost and expected activity for each of the company's three activity cost pools are as follows: Estimated Expected Activity Activity Cost Pools Overhead Cost Product A Product B Total Product design $ 23,500 400 100 500 Assembling $ 18,000 500 200 700 Supporting customers $ 34,600 600 300 900 The activity rate under the activity-based costing system for Supporting customers is closest to:.