-33.13% is the change from 830 to 555
Calculation steps:
[( 555 - 830 ) ÷ 830] x 100 = -33.13%
Formula
Percentage change = [(555 - 830) / 830] x 100
Subtract the new number by the original number
555 - 830 = -275
-275 ÷ 830 = -0.3313253012048193
-0.3313253012048193 x 100 = -33.13%