-54.78% is the change from 931 to 421
Calculation steps:
[( 421 - 931 ) ÷ 931] x 100 = -54.78%
Formula
Percentage change = [(421 - 931) / 931] x 100
Subtract the new number by the original number
421 - 931 = -510
-510 ÷ 931 = -0.547798066595059
-0.547798066595059 x 100 = -54.78%