-4.42% is the change from 339 to 324
Calculation steps:
[( 324 - 339 ) ÷ 339] x 100 = -4.42%
Formula
Percentage change = [(324 - 339) / 339] x 100
Subtract the new number by the original number
324 - 339 = -15
-15 ÷ 339 = -0.04424778761061947
-0.04424778761061947 x 100 = -4.42%