78.95% is the change from 19 to 34
Calculation steps:
[( 34 - 19 ) ÷ 19] x 100 = 78.95%
Formula
Percentage change = [(34 - 19) / 19] x 100
Subtract the new number by the original number
34 - 19 = 15
15 ÷ 19 = 0.7894736842105263
0.7894736842105263 x 100 = 78.95%