-29.85% is the change from 670 to 470
Calculation steps:
[( 470 - 670 ) ÷ 670] x 100 = -29.85%
Formula
Percentage change = [(470 - 670) / 670] x 100
Subtract the new number by the original number
470 - 670 = -200
-200 ÷ 670 = -0.29850746268656714
-0.29850746268656714 x 100 = -29.85%