need an explanation the correct answer is already there

First National Bank currently offers traditional banking services, from which they generate an average return of 5% while bearing a risk (o) of 3%. They are planning to allocate 69% of their activity to non-traditional services from which they expect an average return of 16% while bearing a risk ( ( ) of 5%. The correlation () between traditional and non-traditional revenues is 0.5. What would be the expected return of this portfolio of " 2 assets"? Type your answer as percentage and not as decimal (i.e. 5.2 and not 0.052 ). Round your solution to the nearest three decimals if needed. Do not type the \% symbol. 12.59 margin of error +1.2% Remember the expected return in this case is simply: weight.traditional" return.traditional + weight.nontraditional"return.nontraditional