Current location - Training Enrollment Network - Mathematics courses - The price of primary school math problems is suitable for 200 yuan. Profit equals to selling 1 1 yuan, and selling 15 yuan equals selling 165 yuan.
The price of primary school math problems is suitable for 200 yuan. Profit equals to selling 1 1 yuan, and selling 15 yuan equals selling 165 yuan.
If the purchase price is X, the profit of 10 yuan is 10×20-20x, and the profit of 1 1 yuan is1×15x.

1 1× 15- 15x = 10×20-20x

165- 15x=200-20x，

5x=35，

x=7，

The purchase price of these pens is one 7 yuan each.

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