-21.34% is the change from 492 to 387
Calculation steps:
[( 387 - 492 ) ÷ 492] x 100 = -21.34%
Formula
Percentage change = [(387 - 492) / 492] x 100
Subtract the new number by the original number
387 - 492 = -105
-105 ÷ 492 = -0.21341463414634146
-0.21341463414634146 x 100 = -21.34%