-8.29% is the change from 350 to 321
Calculation steps:
[( 321 - 350 ) ÷ 350] x 100 = -8.29%
Formula
Percentage change = [(321 - 350) / 350] x 100
Subtract the new number by the original number
321 - 350 = -29
-29 ÷ 350 = -0.08285714285714285
-0.08285714285714285 x 100 = -8.29%