-84.62% is the change from 650 to 100
Calculation steps:
[( 100 - 650 ) ÷ 650] x 100 = -84.62%
Formula
Percentage change = [(100 - 650) / 650] x 100
Subtract the new number by the original number
100 - 650 = -550
-550 ÷ 650 = -0.8461538461538461
-0.8461538461538461 x 100 = -84.62%