84.86% is the change from 449 to 830
Calculation steps:
[( 830 - 449 ) ÷ 449] x 100 = 84.86%
Formula
Percentage change = [(830 - 449) / 449] x 100
Subtract the new number by the original number
830 - 449 = 381
381 ÷ 449 = 0.8485523385300668
0.8485523385300668 x 100 = 84.86%