1700% is the change from 50 to 900
Calculation steps:
[( 900 - 50 ) ÷ 50] x 100 = 1700%
Formula
Percentage change = [(900 - 50) / 50] x 100
Subtract the new number by the original number
900 - 50 = 850
850 ÷ 50 = 17
17 x 100 = 1700%
Example