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Mathematics for the sixth grade entrance examination
The profit per pen sold is 10*40%=4 yuan.

The number of pens sold in 240 yuan is 240/4=60.

The purchase quantity is 60/3/4=80.

What the teacher said is wrong.

Suppose what the teacher said is right.

Bought 120.

Sold 3/4, sold 90,

The profit of each branch is 4 yuan, that is, 90*4=360 yuan.

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