I'll do the job for 100 dollars and not a penny less. [=I won't do the job unless I am paid at least 100 dollars]要我干这份工作，得付我100美元，一分钱也不能少。

I'll pay you 100 dollars and not a penny more. [=I'll pay you 100 dollars, but I won't pay you any more than that]我付你100美元，一分钱也不能再多。