71.49% is the change from 449 to 770
Calculation steps:
[( 770 - 449 ) ÷ 449] x 100 = 71.49%
Formula
Percentage change = [(770 - 449) / 449] x 100
Subtract the new number by the original number
770 - 449 = 321
321 ÷ 449 = 0.7149220489977728
0.7149220489977728 x 100 = 71.49%