A stationary shopkeeper earns a profit of 2 by selling a pen and incurs a loss of 3 by selling a notebook
(1) If he sold 25 pens and 15 notebooks on a day, what would be his net profit or loss on that day?
(ii) What is the number of pens he must sell on a day to have neither profit nor loss if the number of notebooks sold on that day is 50?
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