19.24% is the change from 421 to 502
Calculation steps:
[( 502 - 421 ) ÷ 421] x 100 = 19.24%
Formula
Percentage change = [(502 - 421) / 421] x 100
Subtract the new number by the original number
502 - 421 = 81
81 ÷ 421 = 0.19239904988123516
0.19239904988123516 x 100 = 19.24%