234.66% is the change from 251 to 840
Calculation steps:
[( 840 - 251 ) ÷ 251] x 100 = 234.66%
Formula
Percentage change = [(840 - 251) / 251] x 100
Subtract the new number by the original number
840 - 251 = 589
589 ÷ 251 = 2.346613545816733
2.346613545816733 x 100 = 234.66%