You have invested in a portfolio that contains several stocks. After some time, you'll want to sell off your entire holding in one of the stocks in your portfolio. Your portfolio has an expected return of $9\mathrm{.}06\%,$ and the stock you're selling has an expected return of $10\mathrm{.}70\%.$ What is the expected return of your new portfolio if the stock you are selling had a weight of $0\mathrm{.}18$ in the original portfolio?

$($Correct answer is $8,7\%)$