A shopkeeper earns a profit of Rs 1 by selling one pen and suffer loss of Rs 30 paise on sell of one pencil. In a particular month, he incurs a loss of Rs 5. In that month, he sold 40 pens. How many pencils did he sell in that period?
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Profit on 1 pen = +1 rupees = +100 paisa
loss on 1 pencil = -40 paisa
Total loss = -5 rupees
= -5×100 paisa
= -500 paisa
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