280% is the change from 20 to 76
Calculation steps:
[( 76 - 20 ) ÷ 20] x 100 = 280%
Formula
Percentage change = [(76 - 20) / 20] x 100
Subtract the new number by the original number
76 - 20 = 56
56 ÷ 20 = 2.8
2.8 x 100 = 280%
Example