20.85% is the change from 331 to 400
Calculation steps:
[( 400 - 331 ) ÷ 331] x 100 = 20.85%
Formula
Percentage change = [(400 - 331) / 331] x 100
Subtract the new number by the original number
400 - 331 = 69
69 ÷ 331 = 0.2084592145015106
0.2084592145015106 x 100 = 20.85%