-57.14% is the change from 49 to 21
Calculation steps:
[( 21 - 49 ) ÷ 49] x 100 = -57.14%
Formula
Percentage change = [(21 - 49) / 49] x 100
Subtract the new number by the original number
21 - 49 = -28
-28 ÷ 49 = -0.5714285714285714
-0.5714285714285714 x 100 = -57.14%