You are given the following information: Use the Variance – Covariance matrix in the Excel file: Efficient Portfolios Data. Construct a model to determine the following: 

a. Calculate an envelope portfolio assuming the risk-free rate is 3%?. 

b. Calculate an envelope portfolio assuming the risk-free rate is 12%?. 

c. Create a one-way data table that determines the different means and standard deviations for combinations of Envelope Portfolio 1 and Envelope Portfolio 2 by varying the proportion of Portfolio 1 from -5 to +5 in increments of 0.50.?

Efficient Portfolios Data
	Variance - Covariance Matrix
	A	B	C	D	E		Means
A	0.0030	0.0003	-0.0001	-0.0004	-0.0007		1.7000%
B	0.0003	0.0350	0.0021	0.0050	0.0023		1.7300%
C	-0.0001	0.0021	0.0160	0.0023	0.0029		4.0100%
D	-0.0004	0.0050	0.0023	0.0077	0.0022		1.9600%
E	-0.0007	0.0023	0.0029	0.0022	0.0090		0.1200%