118.76% is the change from 421 to 921
Calculation steps:
[( 921 - 421 ) ÷ 421] x 100 = 118.76%
Formula
Percentage change = [(921 - 421) / 421] x 100
Subtract the new number by the original number
921 - 421 = 500
500 ÷ 421 = 1.187648456057007
1.187648456057007 x 100 = 118.76%