Find the area of the black region

A farmer purchases an old, run-down, abandoned farm with plans to turn it into a thriving enterprise. The fields are grown over with weeds, the farmhouse is falling apart, and the fences are collapsing all around.During his first day of work, the town preacher stops by to bless the man's work, saying, "May you and God work together to make this the farm of your dreams!"A few months later, the preacher stops by again to call on the farmer. Lo and behold, it's like a completely different place--the farm house is completely rebuilt and in excellent condition, there are plenty of cattle and other livestock happily munching on feed in well-fenced pens, and the fields are filled with crops planted in neat rows. "Amazing!" the preacher says. "Look what God and you have accomplished together!""Yes, reverend," says the farmer, "but remember what the farm was like when God was working it alone!"