A shopkeeper earns a profit of rupee 1 by selling one pen and incurs a loss of 40 paise per pencil while selling pencils of her o

A shopkeeper earns a profit of rupee 1 by selling one pen and incurs a loss of 40 paise per pencil while selling pencils of her old stock In particular month she sells 5 pencils in the next month she earns neither profit nor loss if she solds 70 pens how many pencils she sell?

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