18.93% is the change from 840 to 999
Calculation steps:
[( 999 - 840 ) ÷ 840] x 100 = 18.93%
Formula
Percentage change = [(999 - 840) / 840] x 100
Subtract the new number by the original number
999 - 840 = 159
159 ÷ 840 = 0.18928571428571428
0.18928571428571428 x 100 = 18.93%