138.66% is the change from 344 to 821
Calculation steps:
[( 821 - 344 ) ÷ 344] x 100 = 138.66%
Formula
Percentage change = [(821 - 344) / 344] x 100
Subtract the new number by the original number
821 - 344 = 477
477 ÷ 344 = 1.3866279069767442
1.3866279069767442 x 100 = 138.66%