137.97% is the change from 345 to 821
Calculation steps:
[( 821 - 345 ) ÷ 345] x 100 = 137.97%
Formula
Percentage change = [(821 - 345) / 345] x 100
Subtract the new number by the original number
821 - 345 = 476
476 ÷ 345 = 1.3797101449275362
1.3797101449275362 x 100 = 137.97%