218.18% is the change from 264 to 840
Calculation steps:
[( 840 - 264 ) ÷ 264] x 100 = 218.18%
Formula
Percentage change = [(840 - 264) / 264] x 100
Subtract the new number by the original number
840 - 264 = 576
576 ÷ 264 = 2.1818181818181817
2.1818181818181817 x 100 = 218.18%