$1.$ You have $$100,000$ invested in a three$-$stock technology portfolio. $$30,000$ is invested in FB$,$ $$40,000$ in EBAY, and the remainder is invested in MSFT$.$ The beta of FB is $1\mathrm{.}06,$ the beta of EBAY is $1\mathrm{.}72,$ and the beta of MSFT is $0\mathrm{.}95.$ What is the portfolio$$s beta $($round your answer to two decimal places? $($I$)$Describe the assumptions related to the problems:

$($ii$)$ Apply the appropriate mathematical model:

$($iii$)$ Calculation: