Yo trabajé en el supermercado la semana pasada
yes. It is since the Mexican war of Independence was on September 16th, So was the Mexican Independence.
Impuesto al valor agregado!
Here's some websites I found:
Guatemala- https://www.oanda.com/currency/iso-currency-codes/GTQ
Peru- http://www.machupicchu.org/peru_currency.htm
Costa Rica- https://costaricamonkeytours.com/costarica-travelguide/currency/
Hope this helps :)