-71.77% is the change from 549 to 155
Calculation steps:
[( 155 - 549 ) ÷ 549] x 100 = -71.77%
Formula
Percentage change = [(155 - 549) / 549] x 100
Subtract the new number by the original number
155 - 549 = -394
-394 ÷ 549 = -0.7176684881602914
-0.7176684881602914 x 100 = -71.77%