-27.5% is the change from 680 to 493
Calculation steps:
[( 493 - 680 ) ÷ 680] x 100 = -27.5%
Formula
Percentage change = [(493 - 680) / 680] x 100
Subtract the new number by the original number
493 - 680 = -187
-187 ÷ 680 = -0.275
-0.275 x 100 = -27.5%