Please show the steps to how you got the correct answer. Thank you.

1.You invest 70% of your money on a stock with expected return of 15% and standard deviation of 22%. The rest of your money is invested in T-bills with expected return of 7%. The expected return and standard deviation of your complete portfolio are

a.12.6% and 15.4%.

b.15% and 22%.

c.7% and 0%.

d.11% and 11%.

e.None of the above option is correct.