840% is the change from 80 to 752
Calculation steps:
[( 752 - 80 ) ÷ 80] x 100 = 840%
Formula
Percentage change = [(752 - 80) / 80] x 100
Subtract the new number by the original number
752 - 80 = 672
672 ÷ 80 = 8.4
8.4 x 100 = 840%
Example