Manoj sold 12 pens at a profit of 20% and 8 pens at a profit of 10%. The profit would have been reduced by 36, if he had sold all the 20 pens at a profit of 15%. What is the cost price of each pen?
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the process by which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a by-product.
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