-54.2% is the change from 917 to 420
Calculation steps:
[( 420 - 917 ) ÷ 917] x 100 = -54.2%
Formula
Percentage change = [(420 - 917) / 917] x 100
Subtract the new number by the original number
420 - 917 = -497
-497 ÷ 917 = -0.5419847328244275
-0.5419847328244275 x 100 = -54.2%