假设某银行只有一个营业员办理存款业务，顾客每3～8分钟到来一位并依次排队办理业务。所有顾客办都只办理一笔定期存款的业务，存款金额从1000元～50000元的整数。营业员办理每笔存款业务2～7分钟。下表为今年8月19日银行加息前后的存款年利率情况。-Suppose a bank is only a salesperson a deposit business, the customer every 3 ~ 8 minutes, and followed by the arrival of a queue conducted business. All customers to do business only apply for a time deposit, deposit the amount of from 1,000 yuan to 50,000 yuan integer. Each salesperson handling deposits 2 ~ 7 minutes. The table for this year' s August 19 banks raise interest rates before and after the annual interest rate of deposits.