-34.28% is the change from 423 to 278
Calculation steps:
[( 278 - 423 ) ÷ 423] x 100 = -34.28%
Formula
Percentage change = [(278 - 423) / 423] x 100
Subtract the new number by the original number
278 - 423 = -145
-145 ÷ 423 = -0.34278959810874704
-0.34278959810874704 x 100 = -34.28%