Questions & Answers about Očitanje i tarifa su na računu.
Because the subject is actually two nouns joined by i:
- očitanje = reading / meter reading
- tarifa = tariff / rate
When two singular nouns are connected by i (and), the whole subject is treated as plural, so Serbian uses su (are), not je (is).
- Očitanje je na računu. = The reading is on the bill.
- Tarifa je na računu. = The tariff is on the bill.
- Očitanje i tarifa su na računu. = The reading and the tariff are on the bill.
Računu is in the locative singular.
That is because it follows the preposition na in a meaning of location:
- na računu = on the bill / on the invoice
A very common Serbian pattern is:
- na + locative for being somewhere
- na + accusative for motion toward somewhere
So here:
- su na računu = are on the bill
The basic noun is račun, and its locative singular form is računu.