1945% is the change from 40 to 818
Calculation steps:
[( 818 - 40 ) ÷ 40] x 100 = 1945%
Formula
Percentage change = [(818 - 40) / 40] x 100
Subtract the new number by the original number
818 - 40 = 778
778 ÷ 40 = 19.45
19.45 x 100 = 1945%
Example