1500% is the change from 50 to 800
Calculation steps:
[( 800 - 50 ) ÷ 50] x 100 = 1500%
Formula
Percentage change = [(800 - 50) / 50] x 100
Subtract the new number by the original number
800 - 50 = 750
750 ÷ 50 = 15
15 x 100 = 1500%
Example