For the restaurant industry, a quarter of transactions still happen in cash, so the elimination of the penny could mean as much as $14 million in lost monthly revenue if eateries have to keep rounding up to make change. That has led the National Restaurant Association to push the federal government to allow pennies to continue circulating. At the same time, the group is advocating for legislation, called the Common Cents Act, that would set up national rounding rules to help businesses better manage the currency shift.