In a related story...
I lived and worked in Peru for a while in a former life when I worked in the oil patch. The unit of currency there at the time was the Sol and the official exchange rate was 40 Soles to the US$.
We spent a lot of our time in the jungle towns across the Andes from Lima. Once a brand new guy to the country flew into Lima from the States, changed planes in Lima and after converting a bunch of dollars to Soles, flew out to Iquitos. He did not speak a word of Spanish and had no idea about the local currency or the exchange rate. He landed in the Iquitos airport and took a cab to his company's office, which was a 160 Sol (US$4) fare. Lima was at the time (1976) fairly cosmopolitan with lots of English speakers, but Iquitos (which sits at he confluence of the Miranon and Yucale rivers [spelled wrong, I am sure] where they first start calling it the Amazon), not so much.
When the cab got to his office he looked questioningly at the cabbie, who told him what the fare was in Spanish, which the guy did not understand. He looked at the wad of bills he had, peeled off the largest bill he had (a 1000 Sol note) and handed it to the cabbie. The cabbie told him (in plain Spanish) that he didn't have change, which was as far as I know, the truth. The guy didn't understand a word of it and thought the driver was asking for more, so he peeled off another 1000 Sol note and handed it to the driver, who told him, LOUDER and SLOWER (people are the same everywhere) that he didn't have change. The guy responded by peeling off yet another 1000 Sol note and handing it to the cabbie, who finally just said, "gracias" and drove off. When the guy found that he had paid US$75 for a US$4 cab ride, he was, of course, upset. The rest of us thought it was hilarious.