96/128*100% = 75% (96 is 75% of 128)
128/96*100% = 133 1/3% (128 is 133 1/3% of 96)
(96-128)/128*100% = -25% (the change from 128 to 96 is a drop of 25%)
(128-96)/96*100% = 33 1/3% (the change from 96 to 128 is an increase of 33 1/3%)
Your question is not asked in a way that helps me figure out what you mean. Perhaps you mean one of these. Take your pick.
128/96*100% = 133 1/3% (128 is 133 1/3% of 96)
(96-128)/128*100% = -25% (the change from 128 to 96 is a drop of 25%)
(128-96)/96*100% = 33 1/3% (the change from 96 to 128 is an increase of 33 1/3%)
Your question is not asked in a way that helps me figure out what you mean. Perhaps you mean one of these. Take your pick.