Your father has $500,000 invested at annual rate of 8%, and he now wants to retire. He wants to withdraw $50,000 at the end of each year, beginning at the end of this year. How many years will it take to exhaust his funds?

Financial calculator solution.
Inputs:
I = 8 / 1 .
PV= 500000 .
PMT = 50000 .
FV= 0 .
 
Output: N = ?