99.29% is the change from 423 to 843
Calculation steps:
[( 843 - 423 ) ÷ 423] x 100 = 99.29%
Formula
Percentage change = [(843 - 423) / 423] x 100
Subtract the new number by the original number
843 - 423 = 420
420 ÷ 423 = 0.9929078014184397
0.9929078014184397 x 100 = 99.29%