-55.74% is the change from 610 to 270
Calculation steps:
[( 270 - 610 ) ÷ 610] x 100 = -55.74%
Formula
Percentage change = [(270 - 610) / 610] x 100
Subtract the new number by the original number
270 - 610 = -340
-340 ÷ 610 = -0.5573770491803278
-0.5573770491803278 x 100 = -55.74%