-77.19% is the change from 320 to 73
Calculation steps:
[( 73 - 320 ) ÷ 320] x 100 = -77.19%
Formula
Percentage change = [(73 - 320) / 320] x 100
Subtract the new number by the original number
73 - 320 = -247
-247 ÷ 320 = -0.771875
-0.771875 x 100 = -77.19%