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A shopkeeper earns a profit of rs 6 by selling 1 notebook and incurs a loss of rs 4 by selling a pen from his old stock.

In a particular week he suffered a loss of rs100 if he sold 30 notebooks then how many pen did he sell?

In the next week he earns neither profit nor does he incur any loss. If he sold 40 notebooks then how many pens did he sell?

2
by anusingh2005

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