An analysis of bank's processes has provided management with the following information for designing an ABC system for its activities and the related costs: PROCESSING WORKING WITH Total Costs ACCOUNTS CUSTOMERS OTHER TOTAL Tellers' wages $ 160,000 70% 20% 10% 100% Assistant manager's salary $ 75,000 20% 75% 5% 100% Branch manager's salary $ 80,000 10% 50% 40% 100% $ 315,000 The total costs in the activity cost pool for the activity, working with customers, is: $135,000. $175,000. $128,250. $51,750. $160,000