43.4% is the change from 318 to 456
Calculation steps:
[( 456 - 318 ) ÷ 318] x 100 = 43.4%
Formula
Percentage change = [(456 - 318) / 318] x 100
Subtract the new number by the original number
456 - 318 = 138
138 ÷ 318 = 0.4339622641509434
0.4339622641509434 x 100 = 43.4%