4900% is the change from 17 to 850
Calculation steps:
[( 850 - 17 ) ÷ 17] x 100 = 4900%
Formula
Percentage change = [(850 - 17) / 17] x 100
Subtract the new number by the original number
850 - 17 = 833
833 ÷ 17 = 49
49 x 100 = 4900%
Example