-78.53% is the change from 340 to 73
Calculation steps:
[( 73 - 340 ) ÷ 340] x 100 = -78.53%
Formula
Percentage change = [(73 - 340) / 340] x 100
Subtract the new number by the original number
73 - 340 = -267
-267 ÷ 340 = -0.7852941176470588
-0.7852941176470588 x 100 = -78.53%