-21.5% is the change from 493 to 387
Calculation steps:
[( 387 - 493 ) ÷ 493] x 100 = -21.5%
Formula
Percentage change = [(387 - 493) / 493] x 100
Subtract the new number by the original number
387 - 493 = -106
-106 ÷ 493 = -0.2150101419878296
-0.2150101419878296 x 100 = -21.5%