77.65% is the change from 349 to 620
Calculation steps:
[( 620 - 349 ) ÷ 349] x 100 = 77.65%
Formula
Percentage change = [(620 - 349) / 349] x 100
Subtract the new number by the original number
620 - 349 = 271
271 ÷ 349 = 0.7765042979942693
0.7765042979942693 x 100 = 77.65%