An investor has a current portfolio valued at $8,000 with a beta of 1.1 and an expected rate of return of 10%. The investor buys 100 shares of stock for $20 per share with an expected rate of return of 20% and a beta of 1.0. What is the expected rate of return for the portfolio after the purchase of the stock?

	a.	13.3%
	b.	10.5%
	c.	11.0%
	d.	12.0%