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The clothing store sells a T-shirt. If you sell 64 yuan for each T-shirt, you will lose 20% and earn 15%. You must sell more t-shirts.
Hello: Let me answer you!

Solution: Set the original price as χ yuan.

(χ-64)÷χ=20%

χ=80

Now you can earn 15% for every yuan you sell.

y \80 = 1+ 15%

y=92

A: Now I want to earn 15% and sell everything to 92 yuan.

I hope you are satisfied!