Consider an investor with initial wealth of W0=10000. He/she has the opportunity to invest in a risk-free account yielding 4% p.a. or in a stock index account with an expected rate of return of 10% p.a. and respective standard deviation of 25% p.a. The expected utility function, defined over final wealth is given by E[U(W1)]=E[(W1)(a/2)Var(W1). The risk aversion parameter has value a=0.00025. a) State the decision problem in terms of expected wealth and the variance of the expected wealth as a function of the portfolio weights ( w for the risk-free asset and (1w) for the risky asset). b) Depict the decision problem in a -diagram