Some folks have a very hard time converting the local currency to their own currency when travelling. I have never struggled with this for two reasons. First, l was an accountant during my working career and, second, from 5 years old at school I was very strong at Arithmetic. So, l look at the currency issue as a basic Arithmetic exercise and, with the help of rounding, l can guesstimate very quickly how much the person l am dealing with wants to charge me for his or her product.
It is quite common in parts of Africa that upon being seen in the street and having been assessed as an American one hears the cry"Camio,camio" which l translate to mean money. I have been approached with this cry many times. If l do need local currency I have already established at range of exchange rates that I will agree to. A ten percent "rip off " will usually amount to a very small sum of money in my own currency.
One of the things that l experienced twice and was surprised by was the use of the us dollar as the national currency. I spent six weeks in Ecuador in 2016 and was surprised to learn that they had withdrawn their own currency in January 2000 and replaced it with the US dollar. I was even more surprised this past summer when a short stay in Zimbabwe revealed that they, too had, withdrawn their own currency and replaced it with the US currency. I had been in Zimbabwe in the dark days of Fall 2018 when Zimbabwe currency, US currency and even the South African rand were very hard to come by. That trip remains the most difficult trip l have ever made. But I was very pleasantly surprised at the ease with which money flowed this past summer.