70.04% is the change from 494 to 840
Calculation steps:
[( 840 - 494 ) ÷ 494] x 100 = 70.04%
Formula
Percentage change = [(840 - 494) / 494] x 100
Subtract the new number by the original number
840 - 494 = 346
346 ÷ 494 = 0.7004048582995951
0.7004048582995951 x 100 = 70.04%