-30.99% is the change from 71 to 49
Calculation steps:
[( 49 - 71 ) ÷ 71] x 100 = -30.99%
Formula
Percentage change = [(49 - 71) / 71] x 100
Subtract the new number by the original number
49 - 71 = -22
-22 ÷ 71 = -0.30985915492957744
-0.30985915492957744 x 100 = -30.99%