Prove that if x1, x2 with x1+x2 = 1 give the proportion of wealth

| August 30, 2017

Question
MEAN VARIANCE PORTFOLIO THEORY HELP
Prove that if x1, x2 with x1+x2 = 1 give the proportion of wealth invested in two assets that deliver a percentage return R1 and R2 respectively, then the portfolio return is given by R = x1R1 + x2R2

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