2075% is the change from 40 to 870
Calculation steps:
[( 870 - 40 ) ÷ 40] x 100 = 2075%
Formula
Percentage change = [(870 - 40) / 40] x 100
Subtract the new number by the original number
870 - 40 = 830
830 ÷ 40 = 20.75
20.75 x 100 = 2075%
Example