80.58% is the change from 345 to 623
Calculation steps:
[( 623 - 345 ) ÷ 345] x 100 = 80.58%
Formula
Percentage change = [(623 - 345) / 345] x 100
Subtract the new number by the original number
623 - 345 = 278
278 ÷ 345 = 0.8057971014492754
0.8057971014492754 x 100 = 80.58%