This is the 775th most frequent Bulgarian word.
рубли
"Рубли" in Bulgarian means "rubles," the currency of Russia.
In this sentence, 'рубли' is used as a nominative plural to indicate the specific currency that was exchanged.
Вчера обмених 200 рубли за долари.
Yesterday I exchanged 200 rubles for dollars.
Here, 'рубли' is used in the accusative plural to denote the amount of money spent.
За подаръка похарчих само 50 рубли.
For the gift, I only spent 50 rubles.
In this example, 'рубли' appears in the prepositional plural case after the preposition 'в', specifying the currency context.