That's not strictly true. Some of the work I do involves software to do premium calculations for insurance. While pennies do matter for intermediate values duri

That's not strictly true. Some of the work I do involves software to do premium calculations for insurance. While pennies do matter for intermediate values during calculation, virtually everyone rounds the final premium to a dollar amount or the closest 10 cent increment. Nobody cares about pennies when each transaction is hundreds or thousands of dollars.