121.43% is the change from 420 to 930
Calculation steps:
[( 930 - 420 ) ÷ 420] x 100 = 121.43%
Formula
Percentage change = [(930 - 420) / 420] x 100
Subtract the new number by the original number
930 - 420 = 510
510 ÷ 420 = 1.2142857142857142
1.2142857142857142 x 100 = 121.43%