1,000 points if difference between guess price and sold price is < 1%
500 points if difference between guess price and sold price is between 1% and 2%
250 points if difference between guess price and sold price is between 2% and 3%
100 points if difference between guess price and sold price is between 3% and 5%
-100 points if difference between guess price and sold price is > 5%