Selena Maranjian invests in shares having the following expected returns:

COMMON STOCK (Ticker symbol)	Amount invested ()	Expected return
One-Legged Chair Cie (WOOPS)	6000	0.12
Acme explosives Cie (KBOOM)	11000	0.18
Ames-to-Please, Inc. (BOB)	9000	0.15
Sisyphus transport Corp. (UPDWN)	7000	0.25
Excelsior hair growth (SPROUT)	5000	0.30
In-Your-Face-Telemarketing (RINGG)	13000	0.45
McDonald Farms (EIEIO)	9000	0.38

a) What is the expected return of her portfolio?

b) What would be her expected return if she quadrupled her investment in Excelsior hair growth, and kept everything else the same?