-29.18% is the change from 305 to 216
Calculation steps:
[( 216 - 305 ) ÷ 305] x 100 = -29.18%
Formula
Percentage change = [(216 - 305) / 305] x 100
Subtract the new number by the original number
216 - 305 = -89
-89 ÷ 305 = -0.29180327868852457
-0.29180327868852457 x 100 = -29.18%