-71.94% is the change from 310 to 87
Calculation steps:
[( 87 - 310 ) ÷ 310] x 100 = -71.94%
Formula
Percentage change = [(87 - 310) / 310] x 100
Subtract the new number by the original number
87 - 310 = -223
-223 ÷ 310 = -0.7193548387096774
-0.7193548387096774 x 100 = -71.94%