121.14% is the change from 421 to 931
Calculation steps:
[( 931 - 421 ) ÷ 421] x 100 = 121.14%
Formula
Percentage change = [(931 - 421) / 421] x 100
Subtract the new number by the original number
931 - 421 = 510
510 ÷ 421 = 1.2114014251781473
1.2114014251781473 x 100 = 121.14%