please show steps, thank you!

10. Suppose we observe two comparable properties that have both sold twice within the past two years. Property A sold 18 months ago for $550,000 and Property B sold 6 months ago for $525,000. If the two properties were sold today at $625,000 and $560,000, respectively, estimate the change in market conditions (percentage change in price) per month, assuming we equally weight the two properties in our analysis