-96.72% is the change from 305 to 10
Calculation steps:
[( 10 - 305 ) ÷ 305] x 100 = -96.72%
Formula
Percentage change = [(10 - 305) / 305] x 100
Subtract the new number by the original number
10 - 305 = -295
-295 ÷ 305 = -0.9672131147540983
-0.9672131147540983 x 100 = -96.72%