23.04% is the change from 421 to 518
Calculation steps:
[( 518 - 421 ) ÷ 421] x 100 = 23.04%
Formula
Percentage change = [(518 - 421) / 421] x 100
Subtract the new number by the original number
518 - 421 = 97
97 ÷ 421 = 0.23040380047505937
0.23040380047505937 x 100 = 23.04%