40.38% is the change from 312 to 438
Calculation steps:
[( 438 - 312 ) ÷ 312] x 100 = 40.38%
Formula
Percentage change = [(438 - 312) / 312] x 100
Subtract the new number by the original number
438 - 312 = 126
126 ÷ 312 = 0.40384615384615385
0.40384615384615385 x 100 = 40.38%