[horticulturist]

> This is because clients generally do not ring up about pennies.

I’ve had clients ring up about pennies… it can be crazy what some people are motivated by

[AdamN]

The penny doesn't matter but being off by a cent can mean there are serious problems in the workflow.

[TZubiri]

Precision?

Quite common in accounting, the accounting equation must balance, it's like a checksum

[nxobject]

Yes, OP started the sentence with that. But, you do make me wonder if floating-point imprecision would eventually lead to material issues...