82.03% is the change from 423 to 770
Calculation steps:
[( 770 - 423 ) ÷ 423] x 100 = 82.03%
Formula
Percentage change = [(770 - 423) / 423] x 100
Subtract the new number by the original number
770 - 423 = 347
347 ÷ 423 = 0.8203309692671394
0.8203309692671394 x 100 = 82.03%