CASH ORDERS

SO JUST DID 2 PAPA JOHNS PIZZA DELIVERIES AND CHECK OUT MY TIPS? I GET TO THE 2ND DELIVERY AND CUSTOMER ASKS HOW MUCH I SAID $53.80. HE THEN SAYS WHILE HES HANDING ME THE $60 "CAN I GET CHANGE?" I SAID SURE HOW MUCH YOU WANT BACK. HIS ANSWER WAS I DONT KNOW. SO I JUST GAVE HIM 3 BUCKS BACK. SO HE ALMOST DOUBLE NO TIPPED ME! WTF PEOPLE!