Looking at the directed dependency graph,

The cost of making change to requirements is shown in the table

Find the impact of making changes to each of the requirements R1 .. R10.

Cost Requirement Change R1 R2 R3 R4 R5 R4 R6 +10% -20% +8% +5% +20% +10% -25% -10% -11% +15% R10 R7 R8 R9 R10 Cost Requirement Change R1 R2 R3 R4 R5 R4 R6 +10% -20% +8% +5% +20% +10% -25% -10% -11% +15% R10 R7 R8 R9 R10