71.78% is the change from 450 to 773
Calculation steps:
[( 773 - 450 ) ÷ 450] x 100 = 71.78%
Formula
Percentage change = [(773 - 450) / 450] x 100
Subtract the new number by the original number
773 - 450 = 323
323 ÷ 450 = 0.7177777777777777
0.7177777777777777 x 100 = 71.78%