-20.92% is the change from 306 to 242
Calculation steps:
[( 242 - 306 ) ÷ 306] x 100 = -20.92%
Formula
Percentage change = [(242 - 306) / 306] x 100
Subtract the new number by the original number
242 - 306 = -64
-64 ÷ 306 = -0.20915032679738563
-0.20915032679738563 x 100 = -20.92%