Question

A shopkeeper buys 100 pens for 200 and sells
20 of them at a gain of 10%. At what gain per cent
must he sell the remainder so as to gain 20% in all?
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Answer 1

Answer:

400

Step-by-step explanation:

1. 200×2 = 400
2. each pen cost = 2
3. he selled 100 pens for= 200
4. thus 2× 200 = 400