15.91% is the change from 421 to 488
Calculation steps:
[( 488 - 421 ) ÷ 421] x 100 = 15.91%
Formula
Percentage change = [(488 - 421) / 421] x 100
Subtract the new number by the original number
488 - 421 = 67
67 ÷ 421 = 0.15914489311163896
0.15914489311163896 x 100 = 15.91%