  Using Maple, we compute a new exact series solution of a modified
Black-Scholes equation, recently proposed, for the case of the Aunt Michaela
option with a maturity condition of gamma type. We show that the modified
Black-Scholes equation with the Aunt Michaela option is exactly solvable in
terms of associated Laguerre polynomials or equivalently, in terms of Whittaker
M functions. Finally, we make some numerical experiments with the analytical
solutions
