Respuesta :

Answer:

50%

Step-by-step explanation:

The percent gain is calculated as

[tex]\frac{gain}{original}[/tex] × 100%

gain = 27 - 18 = 9 , then

percent gain = [tex]\frac{9}{18}[/tex] × 100% = [tex]\frac{1}{2}[/tex] × 100% = 50%