-34.34% is the change from 830 to 545
Calculation steps:
[( 545 - 830 ) ÷ 830] x 100 = -34.34%
Formula
Percentage change = [(545 - 830) / 830] x 100
Subtract the new number by the original number
545 - 830 = -285
-285 ÷ 830 = -0.3433734939759036
-0.3433734939759036 x 100 = -34.34%