-79.12% is the change from 340 to 71
Calculation steps:
[( 71 - 340 ) ÷ 340] x 100 = -79.12%
Formula
Percentage change = [(71 - 340) / 340] x 100
Subtract the new number by the original number
71 - 340 = -269
-269 ÷ 340 = -0.7911764705882353
-0.7911764705882353 x 100 = -79.12%