Answer:
4,000,000
Explanation:
We start by subtracting his salary (20k) from his annual income. That means he got 100,000 from selling homes.
So, what is 100,000 2.5% of?
I used the equation:
100,000 = .025x
with x being the value of all the homes.
Just divide and conquer, and you end up with a final answer of 4 Million