284.62% is the change from 221 to 850
Calculation steps:
[( 850 - 221 ) ÷ 221] x 100 = 284.62%
Formula
Percentage change = [(850 - 221) / 221] x 100
Subtract the new number by the original number
850 - 221 = 629
629 ÷ 221 = 2.8461538461538463
2.8461538461538463 x 100 = 284.62%