The marked price of a mobile phone is 8000. A shopkeeper sells it at a discount of 20% and earns a profit of 25%. Find the cost price os the mobile phone
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sp = 80 × 80= 6400
cp = 5 unit = 6400
1 unit = 6400/5 = 1280
4 unit = 1280× 4 = 5120 will be the answer
cp = 5 unit = 6400
1 unit = 6400/5 = 1280
4 unit = 1280× 4 = 5120 will be the answer
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