A shopkeeper earns a profit of Re1 by selling one pen and incurs a loss of 40 paise per pencil. In a particularmonthshe incurs a loss of Rs5. If she sold 45 pens, how many pencils did she sell in this period? Next month she sold 70 pens. How many pencils she should sell, so that she earns neither profit no loss? explaination please!!
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