I need help to solve this problem. Please and thank you!

Solution given:
[tex]S_n=?[/tex]
[tex]a_1=0.11[/tex]
[tex]a_5=895.956875[/tex]
r=9.5
no of term(n)=5
we have
[tex]S_n=\frac{last \:term *r-a}{r-1}[/tex]
[tex]S_5=\frac{a_5*r-a}{r-1}[/tex]
[tex]S_5=\frac{895.956875*9.5-0.11}{9.5-1}[/tex]
[tex]S_5=\frac{8511.480313}{8.5}[/tex]
Option 1st is a required answer.