[Tauzero]

"Kinda thinking out loud as I'm typing, that's paying $50,000 early over 10 years to save $100,000, or a 200% return on my investment. Annualized, that's 20%,"

Actually it's a 100% return, which annualizes to a 7.18% return.

(Rule of 72.)

[Dog Gone]

If I invest 50,000 and make 50,000, that looks like a 100% rate of return to me. Or am I somehow not getting my 50,000 invested back?