-64.29% is the change from 210 to 75
Calculation steps:
[( 75 - 210 ) ÷ 210] x 100 = -64.29%
Formula
Percentage change = [(75 - 210) / 210] x 100
Subtract the new number by the original number
75 - 210 = -135
-135 ÷ 210 = -0.6428571428571429
-0.6428571428571429 x 100 = -64.29%