90% is the change from 490 to 931
Calculation steps:
[( 931 - 490 ) ÷ 490] x 100 = 90%
Formula
Percentage change = [(931 - 490) / 490] x 100
Subtract the new number by the original number
931 - 490 = 441
441 ÷ 490 = 0.9
0.9 x 100 = 90%
Example