31.5% is the change from 492 to 647
Calculation steps:
[( 647 - 492 ) ÷ 492] x 100 = 31.5%
Formula
Percentage change = [(647 - 492) / 492] x 100
Subtract the new number by the original number
647 - 492 = 155
155 ÷ 492 = 0.3150406504065041
0.3150406504065041 x 100 = 31.5%