-53.73% is the change from 670 to 310
Calculation steps:
[( 310 - 670 ) ÷ 670] x 100 = -53.73%
Formula
Percentage change = [(310 - 670) / 670] x 100
Subtract the new number by the original number
310 - 670 = -360
-360 ÷ 670 = -0.5373134328358209
-0.5373134328358209 x 100 = -53.73%