After allowing a 70% discount on the marked price of a mobile 15% VAT was levied and sold it. If the difference between the selling price with VAT and selling price after discount is Rs. 1800, find the marked price of the mobile [asap]
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pH and Water
No, you don't often hear your local news broadcaster say "Folks, today's pH value of Dryville Creek is 6.3!" But pH is quite an important measurement of water. Maybe for a science project in school you took the pH of water samples in a chemistry class ... and here at the U.S. Geological Survey we take a pH measurement whenever water is studied. Not only does the pH of a stream affect organisms living in the water, a changing pH in a stream can be an indicator of increasing pollution or some other environmental factor.
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