Question: I need help with this question: (b) What is the variance of a portfolio invested 20 percent each in A and B and 60 percent

I need help with this question:

(b) What is the variance of a portfolio invested 20 percent each in A and B and 60 percent in C?

The table is like:

Probability of State

State of Economy of Economy Stock A Stock B Stock C

Boom .75 .07 .01 .27

Bust .25 .12 .19 -.05

Please provide a thorough explanation

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