Some people like me are not good at calculating and we calculate wrongly or do not compute certain things that we should. In another bank thread, the users say their interests are accurate down to the last cent, but my calculation of my interest is always off, often by a few tens.
I even have to go to the bank to queue up physically just to ask the officer how to calculate and copy down his calculation so that I can ‘revise’ at home and try it out myself. But when I don’t revise again, I forget totally. I’ll have to go to the bank and ask again. To give an example, it took me several tries to understand how to calculate 1% per annum interest meant. I also keep notes on the steps to calculate the progressive type of interest. I used to just dump my money in FD without knowing how much interest I would get because my calculation would not be accurate anyway.
It’s a lot harder when you are not a numbers person.