Style bias and active management calculation

From past paper:

Decision making level Incremental return (%)

Risk-free asset 0.5

Asset category 7.52

Benchmarks 0.14

Investment managers 0.08

Allocation effects -0.1

Total fund 8.14 Calculate style bias and active management: 1. Style bias Style bias = benchmark – market index. Answer is 0.14%. Why do we not subtract a market index value? 2. Active Management Active management = portfolio – benchmark Answer is 0.08% Why is the answer not = 8.14% – 0.14% = 8%

It says incremental return, they already did it for you.