-38.24% is the change from 34 to 21
Calculation steps:
[( 21 - 34 ) ÷ 34] x 100 = -38.24%
Formula
Percentage change = [(21 - 34) / 34] x 100
Subtract the new number by the original number
21 - 34 = -13
-13 ÷ 34 = -0.38235294117647056
-0.38235294117647056 x 100 = -38.24%