79.71% is the change from 345 to 620
Calculation steps:
[( 620 - 345 ) ÷ 345] x 100 = 79.71%
Formula
Percentage change = [(620 - 345) / 345] x 100
Subtract the new number by the original number
620 - 345 = 275
275 ÷ 345 = 0.7971014492753623
0.7971014492753623 x 100 = 79.71%