There was a time not so long ago when cash was king, and people literally carried some at all times. These days you can pay for a lot more things with credit and debit cards, but there are still times when one might need cash. So how much cash should an adult carry on them at any given time these days? Opinions on that vary. A survey from Money magazine found 42 percent of people carry no more than $40 in cash, and 30 percent carry between $41 and $99. But an aggregation of data from various sources finds popular opinion says carrying $200 is just the right amount because it is enough to handle a standard emergency, and it’s likely enough to cover your bill at a restaurant if your credit card gets declined or if you find out the restaurant doesn’t accept plastic. Plus BudgetYourTrip.com says it costs an average of $221 per person for each day traveling within the U.S. And in case you were wondering, the experts say you should have at least $20 in five dollar bills on you at all times, for tipping, but avoid have singles.