Answer
See below
Work Step by Step
Given: $g(x)=x-0.15x=0.85x\\f(x)=x-10$
Obtain: $g(f(x))=0.85(x-10)$
Substituting $x=27$, we have: $g(f(27))=0.85(27-10)=14.45$
Obtain: $f(g(x))=0.85(x)-10$
Substituting $x=27$, we have: $f(g(27))=0.85(27)-10=12.95$