Same sort of deal is why interest rates can be confusing, credit cards always want to quote monthly as it can easily confuse people how they add it all up to the annual cost.
I dont see much confusion here at all.
- You didn't explicit. So, I presume that you were ironic and that is not bad at all.
- Sometimes it isn't difficult, it is impossible without using a complete accounting system that isn't a reasonable help to most consumers.