-22.6% is the change from 500 to 387
Calculation steps:
[( 387 - 500 ) ÷ 500] x 100 = -22.6%
Formula
Percentage change = [(387 - 500) / 500] x 100
Subtract the new number by the original number
387 - 500 = -113
-113 ÷ 500 = -0.226
-0.226 x 100 = -22.6%