142.98% is the change from 342 to 831
Calculation steps:
[( 831 - 342 ) ÷ 342] x 100 = 142.98%
Formula
Percentage change = [(831 - 342) / 342] x 100
Subtract the new number by the original number
831 - 342 = 489
489 ÷ 342 = 1.4298245614035088
1.4298245614035088 x 100 = 142.98%