其实你这两句中文可以译成一句英文.
We will lose money instead of making money if we perform this price.
如果按这个价钱，我们将会亏本，更别说赚钱了. （这样比较委婉）
礼貌点：
I am sorry that this price is lower than my bottom price, we really will lose money if we perform this price.
我真的很抱歉， 这个单价低于我们的最低价了，如果按这个价钱，我们真的会亏钱的.
We're not making any profit for this price.
The bottom line is we're not lossing money.
This is the moderate price! Any way, we cannot be in deficit!
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