Please could you help me with calculation of GDP contribution using the expenditure method?

TABLE B: COST OF PRODUCING SPECIALISED SPARE PARTS

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STAGE OF PRODUCTION SALES VALUE (Euros)

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1/PRODUCTION OF BASIC MATERIALS

Steel 1,000

Plastics 3,000

Semiconductors 1,000

2/ ASSEMBLY OF ENGINE PARTS (MANUFACTURER PRICE) 15,000

3/ WHOLESALE PRICE FOR ENGINE PARTS DEALER 16,000

4/ RETAIL PRICE 18,000

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