You invest $10,000 in a complete portfolio. The complete portfolio is composed of a risky asset with an expected rate of return of 15% and a standard deviation of 20% and a Treasury bill with a rate of return of 5%. How much money should be invested in the risky asset to form a complete portfolio with a return standard deviation of 25%?

$15,000

$8,000

$12,500

$7,000