a shopkeeper earns a profit f rupees 10 by selling one mug and incurs a loss of rupees 4 per soon. In a particular month he incurs a loss of rupees 20. In this period he sold 30 mugs. How many spoons did he sell in this period ? In the next month he earns neither profit nor loss. If he sold 80 mugs, how many spoons did he sell ?
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