136.52% is the change from 345 to 816
Calculation steps:
[( 816 - 345 ) ÷ 345] x 100 = 136.52%
Formula
Percentage change = [(816 - 345) / 345] x 100
Subtract the new number by the original number
816 - 345 = 471
471 ÷ 345 = 1.3652173913043477
1.3652173913043477 x 100 = 136.52%