Harold messed up. The extra amount is all the rent you received on the rent. Had the bank sent you rent checks each month instead of putting the rent into your account, there would simply be no rent on rent. Which is why they call that kind of rent payment simple. This is where the yield figures in.
Yield is a useful term that money people stole from farmers.
It s used to describe the amount of produce actually harvested from what s been planted. In money-rentals, it refers to what was returned in comparison to what was rented. That s the yield. It s rent plus rent on rent. Since the yield is affected by the rent paid on rent, it changes according to the rental payment schedule.