840% is the change from 100 to 940
Calculation steps:
[( 940 - 100 ) ÷ 100] x 100 = 840%
Formula
Percentage change = [(940 - 100) / 100] x 100
Subtract the new number by the original number
940 - 100 = 840
840 ÷ 100 = 8.4
8.4 x 100 = 840%
Example