Given that rate of commission earned by the real estate agent = 4%
Given that required commission that real estate agents wants to earn = $7000.
Now we have to find about how expensive of a house does he have to sell to earn $7000.
So let the cost of house = $x
then commission earned = 4% of x
Given commision is $7000 so both quantities will be equal and we get equation:
4% of x = 7000
0.04x = 7000
x = 7000/0.04
x = 175000
Hence final answer is $175000.