Respuesta :

divide the current with the previous
18/15 = 1.2

move the decimal point to the right two places to get the percentage

120% is your answer

hope this helps
the percent change of 15 to 18 yards
Find the difference between the two
which is three yards
then divide the first one (15) by three
to get 5
1/5 = 20%
the percentage change is 20% 

Hope this helps :)