75.4% is the change from 439 to 770
Calculation steps:
[( 770 - 439 ) ÷ 439] x 100 = 75.4%
Formula
Percentage change = [(770 - 439) / 439] x 100
Subtract the new number by the original number
770 - 439 = 331
331 ÷ 439 = 0.7539863325740319
0.7539863325740319 x 100 = 75.4%