-82.9% is the change from 807 to 138
Calculation steps:
[( 138 - 807 ) ÷ 807] x 100 = -82.9%
Formula
Percentage change = [(138 - 807) / 807] x 100
Subtract the new number by the original number
138 - 807 = -669
-669 ÷ 807 = -0.828996282527881
-0.828996282527881 x 100 = -82.9%