-42.62% is the change from 549 to 315
Calculation steps:
[( 315 - 549 ) ÷ 549] x 100 = -42.62%
Formula
Percentage change = [(315 - 549) / 549] x 100
Subtract the new number by the original number
315 - 549 = -234
-234 ÷ 549 = -0.4262295081967213
-0.4262295081967213 x 100 = -42.62%