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In 1995 a certain store had 1,800 tools in stock that had been purchased for $30 each. If 1,000 of these tools were sold in 1995 for $40 each and the remaining 800 were sold in 1996 for $50 each, how many greater was the gross profit on the tools sold in 1996 than the gross profit on those sold in 1995?
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Cost:1995：1800*30=54000
profit:1995: 1000*40=40000
1996： 800*50=40000
这里要注意：问的是1996比1995多多少？
1995的毛利是：40000-30000=10000
1996的毛利是：40000-24000=16000
所以多6000
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