39.47% is the change from 228 to 318
Calculation steps:
[( 318 - 228 ) ÷ 228] x 100 = 39.47%
Formula
Percentage change = [(318 - 228) / 228] x 100
Subtract the new number by the original number
318 - 228 = 90
90 ÷ 228 = 0.39473684210526316
0.39473684210526316 x 100 = 39.47%