18.76% is the change from 421 to 500
Calculation steps:
[( 500 - 421 ) ÷ 421] x 100 = 18.76%
Formula
Percentage change = [(500 - 421) / 421] x 100
Subtract the new number by the original number
500 - 421 = 79
79 ÷ 421 = 0.1876484560570071
0.1876484560570071 x 100 = 18.76%