1530% is the change from 50 to 815
Calculation steps:
[( 815 - 50 ) ÷ 50] x 100 = 1530%
Formula
Percentage change = [(815 - 50) / 50] x 100
Subtract the new number by the original number
815 - 50 = 765
765 ÷ 50 = 15.3
15.3 x 100 = 1530%
Example