2% of your repayment. Let's say you're paying on a weekly or monthly basis. Let's say monthly basis you're paying roughly $2000. If you add extra 2% under $2000, that 2% extra can save you 14 to 15 years on interest.
To calculate the payoff ratio, you need to divide the average profit of winning trades by the average loss of losing trades.
How can I request a payoff statement? Contact your servicing bank (where you make your monthly mortgage payments) and request a payoff statement.