单项选择题

Note：Last week no more than two cashiers worked at any one time，no cashier worked more than 12hours on the same day，and on each day each cashier worked continuously．
问题18—20参照上述信息：
表头题目：上周市场X中的出纳员的总工作小时数及其每小时的工资。
注：上周任何时候工作的出纳员的人数都不会超过2人，每个出纳员同一天工作都不超过12小时，且每天出纳员的工作都是持续不断的。

On Saturday of last week，Market X was open for 15 hours and exactly four cashiers worked．What was the greatest possible amount that the market could have paid in cashiers’wages for that day（）

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