Your father's employer was just acquired, and he was given a severance payment of $$305,000,$ which he invested

at a $7\mathrm{.}5\%$ annual rate. He now plans to retire, and he wants to withdraw $$35,000$ at the end of each year, starting

at the end of this year. How many years will it take to exhaust his funds, i$.$e$.,$ run the account down to zero?

PLEASE EXPLAIN IT TO ME STEP BY STEP