41.91% is the change from 451 to 640
Calculation steps:
[( 640 - 451 ) ÷ 451] x 100 = 41.91%
Formula
Percentage change = [(640 - 451) / 451] x 100
Subtract the new number by the original number
640 - 451 = 189
189 ÷ 451 = 0.4190687361419069
0.4190687361419069 x 100 = 41.91%