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A primary school math problem! Everybody help me out.
Suppose the original price of shoes is X (yuan)

therefore

X*0 .8 = x40

8X/ 10=X-40

8X= 10*(X-40)

8X= 10X-400

2X=400

X=200

So the original price of this pair of shoes is 200 yuan. Is the answer detailed enough? P

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