79.91% is the change from 428 to 770
Calculation steps:
[( 770 - 428 ) ÷ 428] x 100 = 79.91%
Formula
Percentage change = [(770 - 428) / 428] x 100
Subtract the new number by the original number
770 - 428 = 342
342 ÷ 428 = 0.7990654205607477
0.7990654205607477 x 100 = 79.91%