Definition: In this task, a passage will be given and the goal is to identify an event from the passage. An event is defined as a single word representing something that happened, is happening, or may happen. An event can be factual or hypothetical, positive or negative, certain or uncertain. While most events are based on verbs, an event can also be based on a noun (ex. storm, snow, rainfall) or a copula verb (is, was, been, etc.). The event must not be a pronoun or an adjective. For noun events with multiple words, use the last word in the phrase as event.
Input: Passage: A 20-litre-canister of petrol would cost some 17 dollars, while topping up with gas costs only four dollars," said the head of Yerevan's Ultra taxi service, Aram Hachian, who has converted all his cars. "If we used petrol, many people here wouldn't be able to afford a taxi," he said.

afford