11.89% is the change from 286 to 320
Calculation steps:
[( 320 - 286 ) ÷ 286] x 100 = 11.89%
Formula
Percentage change = [(320 - 286) / 286] x 100
Subtract the new number by the original number
320 - 286 = 34
34 ÷ 286 = 0.11888111888111888
0.11888111888111888 x 100 = 11.89%