Step-by-step explanation:
The computation of the value added at each stage is
Stage Value of transaction Added value
1 $1,000 $1,000
2 $2,500 $1,500 ($2,500 - $1,000)
3 $6,000 $3,500 ($6,000 - $2,500)
4 $12,000 $6,000 ($12,000 - $6,000)
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