If you want to be a missionary, you should probably take an accounting class of some sort. I’m working on cleaning up our cash and bank accounts from the last couple months of being in transition, and I have receipts in 5 different currencies (Malawian Kwacha, US Dollars, Euros, British Pounds, and South African Rand), as well as several currency exchanges to reconcile.
I don’t have a degree in accounting, or anything closely related to accounting or math. Let’s just say: we’ll be having frozen pizza for lunch today. After this I won’t be good for much else!