1100% is the change from 70 to 840
Calculation steps:
[( 840 - 70 ) ÷ 70] x 100 = 1100%
Formula
Percentage change = [(840 - 70) / 70] x 100
Subtract the new number by the original number
840 - 70 = 770
770 ÷ 70 = 11
11 x 100 = 1100%
Example