Rise of prices was caused by the cost rise . определите залог сказуемого

Rise of prices was caused by the cost rise. (Passive Voice).

Рост цен был вызван ростом стоимости

The predicate is in Passive Voice. In Passive Voice the doer of the action is not important, the action is important. In Passive Voice the subject is not the doer of the action, the subject takes the action. The predicate of Passive Voice is formed with the help of auxiliary verb to be + the third form of verb if the verb is irregular, and if verb is regular verb+ed.

The cost rise caused rise of prices. (Active Voice).