Remember that he /she says "simple interest rate of 8.25%"

$500, 000 - $200,000 = $300,000 Simple interest that must be earned.

$200,000 x 0.0825 = $16,500 simple interest earned per year.

**$300,000 / $16,500 = 18.18 years for $200,000 to become $500,000.**