-34.29% is the change from 210 to 138
Calculation steps:
[( 138 - 210 ) ÷ 210] x 100 = -34.29%
Formula
Percentage change = [(138 - 210) / 210] x 100
Subtract the new number by the original number
138 - 210 = -72
-72 ÷ 210 = -0.34285714285714286
-0.34285714285714286 x 100 = -34.29%