-9.18% is the change from 305 to 277
Calculation steps:
[( 277 - 305 ) ÷ 305] x 100 = -9.18%
Formula
Percentage change = [(277 - 305) / 305] x 100
Subtract the new number by the original number
277 - 305 = -28
-28 ÷ 305 = -0.09180327868852459
-0.09180327868852459 x 100 = -9.18%