28.44% is the change from 640 to 822
Calculation steps:
[( 822 - 640 ) ÷ 640] x 100 = 28.44%
Formula
Percentage change = [(822 - 640) / 640] x 100
Subtract the new number by the original number
822 - 640 = 182
182 ÷ 640 = 0.284375
0.284375 x 100 = 28.44%