2357.5% is the change from 40 to 983
Calculation steps:
[( 983 - 40 ) ÷ 40] x 100 = 2357.5%
Formula
Percentage change = [(983 - 40) / 40] x 100
Subtract the new number by the original number
983 - 40 = 943
943 ÷ 40 = 23.575
23.575 x 100 = 2357.5%
Example