Investment horizon and fee structure

A fund sells Class A shares with a front$-$end load of $5\%$ and Class B shares with $12$b$-1$ fees of

$0\mathrm{.}5\%$ as well as back$-$end load fees that start at $6\%$ and fall by $1\%$ for each holding year. Assume

that the fund return net of operating costs is $8\%$ annually. What will be the value of a $$10,000$

investment in Class A and B if the shares are sold after $($a$)1$ year or $($b$)10$ years? $(15$ points$)$