Respuesta :

.78 because 7/8 is .1 something lol
With working with fraction you can divide the two numbers from each other 

So, [tex] \frac{7}{8} [/tex] = .875 (Which can be translated to 0.875
  Other translation →7 ÷ 8 = .875 

Let's compare 0.78    from  0.875
                           .78   and      .875

0.78 as a fraction is: [tex] \frac{39}{50} [/tex] 

But, anyhow! the who that is bigger is most likely [tex] \frac{7}{8} [/tex]

It's all just math :) 
  Compare the numbers from each other