3.85% is the change from 312 to 324
Calculation steps:
[( 324 - 312 ) ÷ 312] x 100 = 3.85%
Formula
Percentage change = [(324 - 312) / 312] x 100
Subtract the new number by the original number
324 - 312 = 12
12 ÷ 312 = 0.038461538461538464
0.038461538461538464 x 100 = 3.85%