# What the arithmetic checks catch, and what they cannot

correct receipt                                      -> PASSES validation
line total is not qty x unit price                   -> [line 'Flat White': 2 x 4.50 is 9.00, not 9.50]
a digit misread in one unit price (3.75 -> 3.15)     -> [lines add up to 12.15, subtotal says 12.75]
total does not equal subtotal + tax                  -> [subtotal 12.75 + tax 1.12 is 13.87, total says 13.97]
currency the app does not support                    -> [currency US$ is not one of [EUR, GBP, INR, USD]]
merchant name typo (text, not arithmetic)            -> PASSES validation
item name typo (text, not arithmetic)                -> PASSES validation

The last two are wrong and pass: arithmetic cannot check spelling.