912.05% is the change from 83 to 840
Calculation steps:
[( 840 - 83 ) ÷ 83] x 100 = 912.05%
Formula
Percentage change = [(840 - 83) / 83] x 100
Subtract the new number by the original number
840 - 83 = 757
757 ÷ 83 = 9.120481927710843
9.120481927710843 x 100 = 912.05%