178 | Short-Term Financial Management - Reserve requirement ratio of 10 percent - Days in month=30 days - Earnings credit rate =0.60 percent a. Calculate the monthly earnings credit allowance and the net service charges. b. Solve for the collected balances required and interpret the value. c. Suppose that the earnings credit rate is re-negotiated upward to 0.75 percent. Recalculate the earnings credit allowance, net service charge, and collected balance required. 2. RWC Incorporated has a monthly ledger balance and deposit float of $200,000 and $25,000, respectively. Regions Bank pays RWC an earnings credit rate of 40 basis points, the reserve requirement ratio is 10 percent, and there a re 30 days in the month. If service charges are $500, what is the net service charge applied to RWC's DDA? To have no net service charge, how much must RWC hold in the DDA