-34.05% is the change from 420 to 277
Calculation steps:
[( 277 - 420 ) ÷ 420] x 100 = -34.05%
Formula
Percentage change = [(277 - 420) / 420] x 100
Subtract the new number by the original number
277 - 420 = -143
-143 ÷ 420 = -0.3404761904761905
-0.3404761904761905 x 100 = -34.05%