83.3% is the change from 449 to 823
Calculation steps:
[( 823 - 449 ) ÷ 449] x 100 = 83.3%
Formula
Percentage change = [(823 - 449) / 449] x 100
Subtract the new number by the original number
823 - 449 = 374
374 ÷ 449 = 0.8329621380846325
0.8329621380846325 x 100 = 83.3%