-39.68% is the change from 310 to 187
Calculation steps:
[( 187 - 310 ) ÷ 310] x 100 = -39.68%
Formula
Percentage change = [(187 - 310) / 310] x 100
Subtract the new number by the original number
187 - 310 = -123
-123 ÷ 310 = -0.3967741935483871
-0.3967741935483871 x 100 = -39.68%