-37.4% is the change from 500 to 313
Calculation steps:
[( 313 - 500 ) ÷ 500] x 100 = -37.4%
Formula
Percentage change = [(313 - 500) / 500] x 100
Subtract the new number by the original number
313 - 500 = -187
-187 ÷ 500 = -0.374
-0.374 x 100 = -37.4%