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Urgent! ! The problem-solving process of the exercises on page 10 1 and the second problem on page 102 of the seventh grade mathematics book published by People's Education Press.
If the price is X yuan and the cost is Y yuan, the equation is obtained:

y-75%*x=30

90%*x-y=25

Two formulas have been added:

15%x=55

x=366.7

So the price is 366.7 yuan.

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