They also may be expecting that was a tip. More likely than not knowing to give change. Though I was going to DQ and they never asked for tips until very recently, they didnt have that option on the debit machines. After they didnt toss and barely sauced my "sauced and tossed" chicken strips, gave me 2 orders of fries instead of 2 onion ring orders, I made a complaint and will not be returning. They sent a $50 gift card.