Market Condition	Probability	Return on	Return on	Return on	Return on
		Stock A	Stock B	Stock C	Stock D
Growth	30%	-20%	50%	60	10%
Normal	40%	30%	80%	0	10%
Recession	30%	80%	10%	-20	10%

Calculate the portfolios expected return and standard deviation if you invest 30% in Stock A, 30% in Stock B, 30% in Stock C and 10% in Stock D.
In order to achieve a portfolio with zero standard deviation, calculate the amount of investment weights on Stock A and Stock B.