$75,000 -
One way to solve the problem is to calculate the value before the increase ($3,000 x 12 = $36,000; $36,000 ÷ .08 = $450,000), calculate the value after the increase ($3,500 x 12 = $42,000; $42,000 ÷ .08 = $525,000), and then calculate the difference ($525,000 - $450,000 = $75,000). Another way would be simply to multiply $500 x 12 ($6,000) and then factor in the capitalization rate ($6,000 ÷ .08 = $75,000).