-70.36% is the change from 280 to 83
Calculation steps:
[( 83 - 280 ) ÷ 280] x 100 = -70.36%
Formula
Percentage change = [(83 - 280) / 280] x 100
Subtract the new number by the original number
83 - 280 = -197
-197 ÷ 280 = -0.7035714285714286
-0.7035714285714286 x 100 = -70.36%