64.47% is the change from 273 to 449
Calculation steps:
[( 449 - 273 ) ÷ 273] x 100 = 64.47%
Formula
Percentage change = [(449 - 273) / 273] x 100
Subtract the new number by the original number
449 - 273 = 176
176 ÷ 273 = 0.6446886446886447
0.6446886446886447 x 100 = 64.47%