-84.78% is the change from 644 to 98
Calculation steps:
[( 98 - 644 ) ÷ 644] x 100 = -84.78%
Formula
Percentage change = [(98 - 644) / 644] x 100
Subtract the new number by the original number
98 - 644 = -546
-546 ÷ 644 = -0.8478260869565217
-0.8478260869565217 x 100 = -84.78%