1550% is the change from 30 to 495
Calculation steps:
[( 495 - 30 ) ÷ 30] x 100 = 1550%
Formula
Percentage change = [(495 - 30) / 30] x 100
Subtract the new number by the original number
495 - 30 = 465
465 ÷ 30 = 15.5
15.5 x 100 = 1550%
Example