-29.63% is the change from 810 to 570
Calculation steps:
[( 570 - 810 ) ÷ 810] x 100 = -29.63%
Formula
Percentage change = [(570 - 810) / 810] x 100
Subtract the new number by the original number
570 - 810 = -240
-240 ÷ 810 = -0.2962962962962963
-0.2962962962962963 x 100 = -29.63%