75% is the change from 228 to 399
Calculation steps:
[( 399 - 228 ) ÷ 228] x 100 = 75%
Formula
Percentage change = [(399 - 228) / 228] x 100
Subtract the new number by the original number
399 - 228 = 171
171 ÷ 228 = 0.75
0.75 x 100 = 75%
Example