A shopping mall can make a profit of 2 yuan for a certain kind of stationery. In order to support the poor mountainous areas, it is now sold to a mountainous school at 70% of the original price. As a result, each stationery is still profitable

Is that the topic?
Suppose the original price is X Yuan and the purchase price is y yuan
x-y=2
0.7x-y=0.2
The solution is x = 6
y=4
A: the purchase price is 4 yuan

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