Average cost of a 2 bedroom apartment in Grayson last year = $625
The average cost of the 2 bedroom apartment in Grayson this year = $650
Increase in average cost of 2 bedroom apartment in Grayson = (650 - 625) dollars
= 25 dollars
Then
Percentage increase in average cost = (25/625) * 100
= 2500/625
= 4 percent
Average increase in price of the 2 bedroom apartment from last year to this year is 4%. I hope this is the answer you were looking for and the procedure is also clear to you.