-86.27% is the change from 51 to 7
Calculation steps:
[( 7 - 51 ) ÷ 51] x 100 = -86.27%
Formula
Percentage change = [(7 - 51) / 51] x 100
Subtract the new number by the original number
7 - 51 = -44
-44 ÷ 51 = -0.8627450980392157
-0.8627450980392157 x 100 = -86.27%