857.5% is the change from 40 to 383
Calculation steps:
[( 383 - 40 ) ÷ 40] x 100 = 857.5%
Formula
Percentage change = [(383 - 40) / 40] x 100
Subtract the new number by the original number
383 - 40 = 343
343 ÷ 40 = 8.575
8.575 x 100 = 857.5%
Example