49.35% is the change from 231 to 345
Calculation steps:
[( 345 - 231 ) ÷ 231] x 100 = 49.35%
Formula
Percentage change = [(345 - 231) / 231] x 100
Subtract the new number by the original number
345 - 231 = 114
114 ÷ 231 = 0.4935064935064935
0.4935064935064935 x 100 = 49.35%