40.85% is the change from 284 to 400
Calculation steps:
[( 400 - 284 ) ÷ 284] x 100 = 40.85%
Formula
Percentage change = [(400 - 284) / 284] x 100
Subtract the new number by the original number
400 - 284 = 116
116 ÷ 284 = 0.4084507042253521
0.4084507042253521 x 100 = 40.85%