68.75% is the change from 80 to 135
Calculation steps:
[( 135 - 80 ) ÷ 80] x 100 = 68.75%
Formula
Percentage change = [(135 - 80) / 80] x 100
Subtract the new number by the original number
135 - 80 = 55
55 ÷ 80 = 0.6875
0.6875 x 100 = 68.75%
Example