经济学题（英语）Car firms buy in raw materials (steel),intermediate goods (windscreens,tyres) and labour to make cars.Windscreen and tyre panies hire workers and also buy raw materials from other industrie
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the value added of the car industry = value added of car firms + value added of windscreen panies + value added of tyre panies
= (sales price of car - material cost of car) + (sales price of windscreen - material cost of windscreen) + (sales price of tyre - material cost of tyre)
= (1000 - 250 - 100) + (150 - 10) + (100 - 10)
= 650 + 140 + 90
= 880