Cashier rounds off R19 item to R20

The item bought was a 100g tin of coffee- yes the butchery sells coffee, it was labeled as R19.00.<br> When we got home we checked all the items against the receipt. The cashier charged us R20.00.<br> Why was this? Where did the extra money go? How many customers are they doing this to? This is theft. Never mind overpricing the item. Please someone investigate. Their telephone number is ***.