-63.88% is the change from 670 to 242
Calculation steps:
[( 242 - 670 ) ÷ 670] x 100 = -63.88%
Formula
Percentage change = [(242 - 670) / 670] x 100
Subtract the new number by the original number
242 - 670 = -428
-428 ÷ 670 = -0.6388059701492538
-0.6388059701492538 x 100 = -63.88%