-34.52% is the change from 310 to 203
Calculation steps:
[( 203 - 310 ) ÷ 310] x 100 = -34.52%
Formula
Percentage change = [(203 - 310) / 310] x 100
Subtract the new number by the original number
203 - 310 = -107
-107 ÷ 310 = -0.34516129032258064
-0.34516129032258064 x 100 = -34.52%