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A store raises the price of a commodity by 50% and then sells it at a 20% discount. As a result, the profit of each commodity is still 10 yuan, What is the cost of this product? Fengfeng went to the stationery store to buy exercise books. The salesperson told her that if there were more than 10 copies, the part after the more than 10 copies would be given a 70% discount. Fengfeng bought 20 copies, which was 1.8 yuan cheaper. Do you know the original price of each copy?
The cost of this product is x yuan
(x+50%x)*0.8-10=x
1.2x-10=x
0.2x=10
x=50
The original price is x yuan per copy
10x+0.7*10x=20x-1.8
3x=1.8
x=0.6
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