-43.12% is the change from 545 to 310
Calculation steps:
[( 310 - 545 ) ÷ 545] x 100 = -43.12%
Formula
Percentage change = [(310 - 545) / 545] x 100
Subtract the new number by the original number
310 - 545 = -235
-235 ÷ 545 = -0.43119266055045874
-0.43119266055045874 x 100 = -43.12%