39.37% is the change from 287 to 400
Calculation steps:
[( 400 - 287 ) ÷ 287] x 100 = 39.37%
Formula
Percentage change = [(400 - 287) / 287] x 100
Subtract the new number by the original number
400 - 287 = 113
113 ÷ 287 = 0.39372822299651566
0.39372822299651566 x 100 = 39.37%