-34.2% is the change from 421 to 277
Calculation steps:
[( 277 - 421 ) ÷ 421] x 100 = -34.2%
Formula
Percentage change = [(277 - 421) / 421] x 100
Subtract the new number by the original number
277 - 421 = -144
-144 ÷ 421 = -0.342042755344418
-0.342042755344418 x 100 = -34.2%