35.06% is the change from 231 to 312
Calculation steps:
[( 312 - 231 ) ÷ 231] x 100 = 35.06%
Formula
Percentage change = [(312 - 231) / 231] x 100
Subtract the new number by the original number
312 - 231 = 81
81 ÷ 231 = 0.35064935064935066
0.35064935064935066 x 100 = 35.06%