You have invested $32$ per cent of your portfolio in an investment with an expected return of $9$ per cent and $68$ per cent of your portfolio in an investment with an expected return of $-3$ per cent. What is the expected return of your portfolio? $($as a percentage to two decimal places; eg $2\mathrm{.}881\%$ is $2\mathrm{.}88))$

a$.5\mathrm{.}16\%$

b$.0\mathrm{.}84\%$

c$.0\mathrm{.}34\%$

d$.6\mathrm{.}96\%$