-3.24% is the change from 309 to 299
Calculation steps:
[( 299 - 309 ) ÷ 309] x 100 = -3.24%
Formula
Percentage change = [(299 - 309) / 309] x 100
Subtract the new number by the original number
299 - 309 = -10
-10 ÷ 309 = -0.032362459546925564
-0.032362459546925564 x 100 = -3.24%