27.79% is the change from 421 to 538
Calculation steps:
[( 538 - 421 ) ÷ 421] x 100 = 27.79%
Formula
Percentage change = [(538 - 421) / 421] x 100
Subtract the new number by the original number
538 - 421 = 117
117 ÷ 421 = 0.27790973871733965
0.27790973871733965 x 100 = 27.79%