-6.35% is the change from 299 to 280
Calculation steps:
[( 280 - 299 ) ÷ 299] x 100 = -6.35%
Formula
Percentage change = [(280 - 299) / 299] x 100
Subtract the new number by the original number
280 - 299 = -19
-19 ÷ 299 = -0.06354515050167224
-0.06354515050167224 x 100 = -6.35%