67.33% is the change from 251 to 420
Calculation steps:
[( 420 - 251 ) ÷ 251] x 100 = 67.33%
Formula
Percentage change = [(420 - 251) / 251] x 100
Subtract the new number by the original number
420 - 251 = 169
169 ÷ 251 = 0.6733067729083665
0.6733067729083665 x 100 = 67.33%