"per year the loan is held" sounds exactly this.
>Since the 5% doesn't change with the amount lent
that is the definition of a '%' sign, isn't it? :)
Using '%' with "per year" is a definition of interest, isn't?
Edit: wow, i just now recognized another possibility - charging 5% x [expected years] upfront - that would be "fee", yes. One fr!cking large fee. Who in sane mind is going to pay it? That sounds like preying on people who have no other choice.