-30% is the change from 210 to 147
Calculation steps:
[( 147 - 210 ) ÷ 210] x 100 = -30%
Formula
Percentage change = [(147 - 210) / 210] x 100
Subtract the new number by the original number
147 - 210 = -63
-63 ÷ 210 = -0.3
-0.3 x 100 = -30%
Example