-69.26% is the change from 270 to 83
Calculation steps:
[( 83 - 270 ) ÷ 270] x 100 = -69.26%
Formula
Percentage change = [(83 - 270) / 270] x 100
Subtract the new number by the original number
83 - 270 = -187
-187 ÷ 270 = -0.6925925925925925
-0.6925925925925925 x 100 = -69.26%