1800% is the change from 50 to 950
Calculation steps:
[( 950 - 50 ) ÷ 50] x 100 = 1800%
Formula
Percentage change = [(950 - 50) / 50] x 100
Subtract the new number by the original number
950 - 50 = 900
900 ÷ 50 = 18
18 x 100 = 1800%
Example