80.23% is the change from 344 to 620
Calculation steps:
[( 620 - 344 ) ÷ 344] x 100 = 80.23%
Formula
Percentage change = [(620 - 344) / 344] x 100
Subtract the new number by the original number
620 - 344 = 276
276 ÷ 344 = 0.8023255813953488
0.8023255813953488 x 100 = 80.23%