-41.56% is the change from 320 to 187
Calculation steps:
[( 187 - 320 ) ÷ 320] x 100 = -41.56%
Formula
Percentage change = [(187 - 320) / 320] x 100
Subtract the new number by the original number
187 - 320 = -133
-133 ÷ 320 = -0.415625
-0.415625 x 100 = -41.56%