-45.16% is the change from 310 to 170
Calculation steps:
[( 170 - 310 ) ÷ 310] x 100 = -45.16%
Formula
Percentage change = [(170 - 310) / 310] x 100
Subtract the new number by the original number
170 - 310 = -140
-140 ÷ 310 = -0.45161290322580644
-0.45161290322580644 x 100 = -45.16%