The risk$-$free rate of return is $3\mathrm{.}9\%$ and the market risk premium is $9\mathrm{.}3\%.$ What is the expected return for the following portfolio?

Stock Betas Investment

AAA $3\mathrm{.}30$ $$400,000$

BBB $2\mathrm{.}70$ $$1,200,000$

CCC $1\mathrm{.}90$ $$1,500,000$

DDD $0\mathrm{.}70$ $$1,800,000$