85.24% is the change from 420 to 778
Calculation steps:
[( 778 - 420 ) ÷ 420] x 100 = 85.24%
Formula
Percentage change = [(778 - 420) / 420] x 100
Subtract the new number by the original number
778 - 420 = 358
358 ÷ 420 = 0.8523809523809524
0.8523809523809524 x 100 = 85.24%