75% is the change from 420 to 735
Calculation steps:
[( 735 - 420 ) ÷ 420] x 100 = 75%
Formula
Percentage change = [(735 - 420) / 420] x 100
Subtract the new number by the original number
735 - 420 = 315
315 ÷ 420 = 0.75
0.75 x 100 = 75%
Example