-63.93% is the change from 671 to 242
Calculation steps:
[( 242 - 671 ) ÷ 671] x 100 = -63.93%
Formula
Percentage change = [(242 - 671) / 671] x 100
Subtract the new number by the original number
242 - 671 = -429
-429 ÷ 671 = -0.639344262295082
-0.639344262295082 x 100 = -63.93%