81.58% is the change from 342 to 621
Calculation steps:
[( 621 - 342 ) ÷ 342] x 100 = 81.58%
Formula
Percentage change = [(621 - 342) / 342] x 100
Subtract the new number by the original number
621 - 342 = 279
279 ÷ 342 = 0.8157894736842105
0.8157894736842105 x 100 = 81.58%