-71.24% is the change from 306 to 88
Calculation steps:
[( 88 - 306 ) ÷ 306] x 100 = -71.24%
Formula
Percentage change = [(88 - 306) / 306] x 100
Subtract the new number by the original number
88 - 306 = -218
-218 ÷ 306 = -0.7124183006535948
-0.7124183006535948 x 100 = -71.24%