-47.64% is the change from 191 to 100
Calculation steps:
[( 100 - 191 ) ÷ 191] x 100 = -47.64%
Formula
Percentage change = [(100 - 191) / 191] x 100
Subtract the new number by the original number
100 - 191 = -91
-91 ÷ 191 = -0.47643979057591623
-0.47643979057591623 x 100 = -47.64%