-63.66% is the change from 666 to 242
Calculation steps:
[( 242 - 666 ) ÷ 666] x 100 = -63.66%
Formula
Percentage change = [(242 - 666) / 666] x 100
Subtract the new number by the original number
242 - 666 = -424
-424 ÷ 666 = -0.6366366366366366
-0.6366366366366366 x 100 = -63.66%