No it need not be entirely wrong, Matematik (by the way since you're being so persnickety, "sample sentence" is the correct form, not "example sentence"). I gave you the analogy of "weigh in" as a verbal form.
So "total in" would be just non standard, which is not the same thing as "wrong", unless you are a very peculiar and crabbèd sort of prescriptivist (even Fowler allowed for the use of "ain't", for example).
So "total in" would be just non standard, which is not the same thing as "wrong", unless you are a very peculiar and crabbèd sort of prescriptivist (even Fowler allowed for the use of "ain't", for example).