So, he has to approximate his overhead costs in advance.

因此，他必须提前估算他的管理费用。

In this case, you have two options: either you round the approximate cost of your meal to a bigger sum and leave this amount, or you join the rest of your friends in splitting the bill evenly.

在这种情况下， 您有两种选择：要么将餐费的大致金额四舍五入并留下这个数额，要么与其他朋友一起平均分摊账单。