Answer:
15%
Step-by-step explanation:
A passive portfolio management is an act of running a portfolio to meet the performance and requirements of a benchmark portfolio.
Given that:
A portfolio manager generates = 20% rate of return
Benchmark portfolio = 15% rate of return
Standard and Poor's 500 index = 10% rate of return.
The passive rate of return will be 15%. This is because a passive rate of return is attained by putting money into the right index fund, From the information given; the benchmark index has an 15% rate of return. As such, that is the return any passive investor could attain as a result of putting money in an index fund.