77.39% is the change from 491 to 871
Calculation steps:
[( 871 - 491 ) ÷ 491] x 100 = 77.39%
Formula
Percentage change = [(871 - 491) / 491] x 100
Subtract the new number by the original number
871 - 491 = 380
380 ÷ 491 = 0.7739307535641547
0.7739307535641547 x 100 = 77.39%