You put $\frac{5}{4}$ of your money in a stock with a beta of $1\mathrm{.}6$ and $-\frac{1}{4}$ in a stock with a beta of $0\mathrm{.}8.$ What is the beta of your portfolio?

a$.1\mathrm{.}4$

b$.1\mathrm{.}6$

c$.1\mathrm{.}8$

d$.2\mathrm{.}0$

e$.2\mathrm{.}2$