-58.36% is the change from 670 to 279
Calculation steps:
[( 279 - 670 ) ÷ 670] x 100 = -58.36%
Formula
Percentage change = [(279 - 670) / 670] x 100
Subtract the new number by the original number
279 - 670 = -391
-391 ÷ 670 = -0.5835820895522388
-0.5835820895522388 x 100 = -58.36%