137.5% is the change from 8 to 19
Calculation steps:
[( 19 - 8 ) ÷ 8] x 100 = 137.5%
Formula
Percentage change = [(19 - 8) / 8] x 100
Subtract the new number by the original number
19 - 8 = 11
11 ÷ 8 = 1.375
1.375 x 100 = 137.5%
Example