50.15% is the change from 331 to 497
Calculation steps:
[( 497 - 331 ) ÷ 331] x 100 = 50.15%
Formula
Percentage change = [(497 - 331) / 331] x 100
Subtract the new number by the original number
497 - 331 = 166
166 ÷ 331 = 0.5015105740181269
0.5015105740181269 x 100 = 50.15%