-71.29% is the change from 310 to 89
Calculation steps:
[( 89 - 310 ) ÷ 310] x 100 = -71.29%
Formula
Percentage change = [(89 - 310) / 310] x 100
Subtract the new number by the original number
89 - 310 = -221
-221 ÷ 310 = -0.7129032258064516
-0.7129032258064516 x 100 = -71.29%