<prompt> Human: Hi, I have been saving most of my money and putting it into my savings account w Ally Bank. My interest is being paid every month but the math doesnt seem to work out unless Im miscalculating... I do not seem to be getting the full 1 interest on my account balance. Why is this? How does the math work ?  <response>: Dividing 1.2 APY by 12 gives a good approximation for small rates.Ideally, youd do 1.012112 - 1 to get the actual monthly interest rate. So instead of 0.1 per month, its actually 0.099454180114 per month. 