>The code processes millions of transactions, but less than .01 % has this error. Any ideas?
That's a typical floating-point rounding fudge. If it's a serious enough problem, you can try to use a more precise type such as long double, or remove floating-point altogether to maintain exact precision. Though I suspect that an imprecision at the eighth decimal place isn't that much of an issue unless you're trying to do something with vanilla C++ types that shouldn't be done with vanilla C++ types. If that's the case, you really need to get a high precision mathematics library.
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