-48.51% is the change from 670 to 345
Calculation steps:
[( 345 - 670 ) ÷ 670] x 100 = -48.51%
Formula
Percentage change = [(345 - 670) / 670] x 100
Subtract the new number by the original number
345 - 670 = -325
-325 ÷ 670 = -0.48507462686567165
-0.48507462686567165 x 100 = -48.51%