Christian Angel holds a $$200,000$ portfolio consisting of the following stocks:

$\backslash$table$[[$Stock$,$Investment,Beta$],[$A$,$$$50,000,1,70],[$B$,$$$50,000,1\mathrm{.}60],[$c$,$$$50,000,1\mathrm{.}90],[$D$,350,000,1\mathrm{.}00],[$Total$,$$$200,000,]]$

What is the portfolio's beta? Do not round your intermediate calculations.

a$.1\mathrm{.}550$

b$.1\mathrm{.}508$

c$.0\mathrm{.}775$

d$.0\mathrm{.}388$

e$.1\mathrm{.}900$