64.13% is the change from 421 to 691
Calculation steps:
[( 691 - 421 ) ÷ 421] x 100 = 64.13%
Formula
Percentage change = [(691 - 421) / 421] x 100
Subtract the new number by the original number
691 - 421 = 270
270 ÷ 421 = 0.6413301662707839
0.6413301662707839 x 100 = 64.13%