-36.73% is the change from 49 to 31
Calculation steps:
[( 31 - 49 ) ÷ 49] x 100 = -36.73%
Formula
Percentage change = [(31 - 49) / 49] x 100
Subtract the new number by the original number
31 - 49 = -18
-18 ÷ 49 = -0.3673469387755102
-0.3673469387755102 x 100 = -36.73%