-74% is the change from 550 to 143
Calculation steps:
[( 143 - 550 ) ÷ 550] x 100 = -74%
Formula
Percentage change = [(143 - 550) / 550] x 100
Subtract the new number by the original number
143 - 550 = -407
-407 ÷ 550 = -0.74
-0.74 x 100 = -74%
Example