2017.5% is the change from 40 to 847
Calculation steps:
[( 847 - 40 ) ÷ 40] x 100 = 2017.5%
Formula
Percentage change = [(847 - 40) / 40] x 100
Subtract the new number by the original number
847 - 40 = 807
807 ÷ 40 = 20.175
20.175 x 100 = 2017.5%
Example