-51.9% is the change from 210 to 101
Calculation steps:
[( 101 - 210 ) ÷ 210] x 100 = -51.9%
Formula
Percentage change = [(101 - 210) / 210] x 100
Subtract the new number by the original number
101 - 210 = -109
-109 ÷ 210 = -0.5190476190476191
-0.5190476190476191 x 100 = -51.9%