-61.9% is the change from 210 to 80
Calculation steps:
[( 80 - 210 ) ÷ 210] x 100 = -61.9%
Formula
Percentage change = [(80 - 210) / 210] x 100
Subtract the new number by the original number
80 - 210 = -130
-130 ÷ 210 = -0.6190476190476191
-0.6190476190476191 x 100 = -61.9%