Answer
See below.
Work Step by Step
Let $x$ be the original price. Then the function for the sale is: $f(x)=x-50$ . The function for the discount when opening an account is $g(x)=0.85x$. Then the composition is: $g(f(x))=g(x-50)=0.85(x-50)=0.85x-42.5$
Plugging in $x=480$ we get: $0.85(480)-42.5=365.5$
