How to explain return after making 100% of the investment back.

[Justin Fox]

So say you invested 91,600 into a home.  You get it rented and net profit is 10%.  After 10 years and making all your money back, you'll still have 10% cashflow.   But when you explain your return to people, do you still calculate it based on your initial investment even though you've made all the money back?  Or do you simply just say ever dollar of profit is all profit, not a percentage of a return?

I might just be overthinking it.  Thanks,

Justin