Don Has $3,000 Invested in AT&T with an Expected Return

Don has $3,000 invested in AT&T with an expected return of 11.6 percent;$10,000 in IBM with an expected return of 12.8 percent;and $6,000 in GM with an expected return of 12.2 percent.What is Don's expected return on his portfolio?

A) 12.42%
B) 12.20%
C) 11.81%
D) Cannot be determined