-80.88% is the change from 340 to 65
Calculation steps:
[( 65 - 340 ) ÷ 340] x 100 = -80.88%
Formula
Percentage change = [(65 - 340) / 340] x 100
Subtract the new number by the original number
65 - 340 = -275
-275 ÷ 340 = -0.8088235294117647
-0.8088235294117647 x 100 = -80.88%