Can you show process as well!

You invest $100 in a complete portfolio. The complete portfolio is composed of a risky asset with an expected rate of return of 8% and a standard deviation of 10% and a Treasury bill with a rate of return of 0.2%. % of the complete portfolio should be invested in the risky asset to form this complete portfolio if it has an expected rate of return of 4.5% A) 55.1 B) 56.3 C) 57.6 D) 58.2