I need help with this one. I dont understand it. If possible can you explain it too? Thank you... :)

Problem 24-11 Consider the following information regarding the performance of a money manager in a recent month. The table represents the actual return of each sector of the manager's portfolio In column 1, the fraction of the portfolio allocated to each sector in column 2, the benchmark or neutral sector allocations in column 3, and the returns of sector Indices in column 4 Actual ReturnActual W 0.5 0.1 0.4 eightBenchmark Weight Index Return Equity Bonds Cash 2.1% 0.6 0.3 0.1 2.68 (S&P 500) 2.3 (Barclay 's Aggregate) 0.6 a-1. What was the manager's return in the month? (Do not round Intermedlate calculations. Input all amounts as posltive values. Round your answer to 2 decimal places.) The manager's return in the month is a-2. What was her overperformance or underperformance? (Do not round intermedlate calculations. Input all amounts as positive values. Round your answer to 2 decimal places.) b. What was the contribution of security selection to relative performance? (Do not round Intermedlate calculations. Round your answer to 2 declmal places. Negatlve amount should be indicated by a minus sign.) Contribution of security selection c. What was the contribution of asset allocation to relative performance? (Do not round Intermediate calculations. Round your answer to 2 declmal places. Negatlve amount should be indicated by a minus sign.) Contribution of asset allocation