82.86% is the change from 420 to 768
Calculation steps:
[( 768 - 420 ) ÷ 420] x 100 = 82.86%
Formula
Percentage change = [(768 - 420) / 420] x 100
Subtract the new number by the original number
768 - 420 = 348
348 ÷ 420 = 0.8285714285714286
0.8285714285714286 x 100 = 82.86%