87.58% is the change from 491 to 921
Calculation steps:
[( 921 - 491 ) ÷ 491] x 100 = 87.58%
Formula
Percentage change = [(921 - 491) / 491] x 100
Subtract the new number by the original number
921 - 491 = 430
430 ÷ 491 = 0.8757637474541752
0.8757637474541752 x 100 = 87.58%