2127.5% is the change from 40 to 891
Calculation steps:
[( 891 - 40 ) ÷ 40] x 100 = 2127.5%
Formula
Percentage change = [(891 - 40) / 40] x 100
Subtract the new number by the original number
891 - 40 = 851
851 ÷ 40 = 21.275
21.275 x 100 = 2127.5%
Example