11.43% is the change from 280 to 312
Calculation steps:
[( 312 - 280 ) ÷ 280] x 100 = 11.43%
Formula
Percentage change = [(312 - 280) / 280] x 100
Subtract the new number by the original number
312 - 280 = 32
32 ÷ 280 = 0.11428571428571428
0.11428571428571428 x 100 = 11.43%