138.64% is the change from 352 to 840
Calculation steps:
[( 840 - 352 ) ÷ 352] x 100 = 138.64%
Formula
Percentage change = [(840 - 352) / 352] x 100
Subtract the new number by the original number
840 - 352 = 488
488 ÷ 352 = 1.3863636363636365
1.3863636363636365 x 100 = 138.64%