-78.72% is the change from 343 to 73
Calculation steps:
[( 73 - 343 ) ÷ 343] x 100 = -78.72%
Formula
Percentage change = [(73 - 343) / 343] x 100
Subtract the new number by the original number
73 - 343 = -270
-270 ÷ 343 = -0.7871720116618076
-0.7871720116618076 x 100 = -78.72%