An active portfolio manager outperformed the benchmark last year by 2.65 %, where the benchmark is the S&P500 index. In analyzing the portfolio for return attribution using the Carhart 4 factor model, you find the following results:

Factor	Portfolio Sensitivity	Benchmark sensitivity	Factor return (%)
RFRF	1.04	1.01	5.63
SMB	-1.06	-0.95	2.31
HML	0.47	0	4.39
WML	0.32	-0.05	6.57

What was the return to the portfolio resulting from the security selection component?

The answer is 8.7

Please show how to get there in excel.