-54.9% is the change from 51 to 23
Calculation steps:
[( 23 - 51 ) ÷ 51] x 100 = -54.9%
Formula
Percentage change = [(23 - 51) / 51] x 100
Subtract the new number by the original number
23 - 51 = -28
-28 ÷ 51 = -0.5490196078431373
-0.5490196078431373 x 100 = -54.9%