138.55% is the change from 345 to 823
Calculation steps:
[( 823 - 345 ) ÷ 345] x 100 = 138.55%
Formula
Percentage change = [(823 - 345) / 345] x 100
Subtract the new number by the original number
823 - 345 = 478
478 ÷ 345 = 1.3855072463768117
1.3855072463768117 x 100 = 138.55%