3400% is the change from 28 to 980
Calculation steps:
[( 980 - 28 ) ÷ 28] x 100 = 3400%
Formula
Percentage change = [(980 - 28) / 28] x 100
Subtract the new number by the original number
980 - 28 = 952
952 ÷ 28 = 34
34 x 100 = 3400%
Example