A portfolio has three investments with weights of $35\%$ in asset $A,25\%$ in asset $B$ and $40\%$ in asset $C.$ The expected return on asset $A$ is $6\%,$ the expected return on asset $B$ is $7\%,$ and the expected return on asset C is $10\%.$ Find what is the expected return on this investment portfollo.

a$-7\mathrm{.}55\%$

b$-7\mathrm{.}25\%$

c$-7\mathrm{.}75\%$

d$-7\mathrm{.}85\%$