-18.71% is the change from 481 to 391
Calculation steps:
[( 391 - 481 ) ÷ 481] x 100 = -18.71%
Formula
Percentage change = [(391 - 481) / 481] x 100
Subtract the new number by the original number
391 - 481 = -90
-90 ÷ 481 = -0.18711018711018712
-0.18711018711018712 x 100 = -18.71%