3. A man buys loo oranges for 2600 and sells there 28 per otange Find the percentage of profit at or loss.
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This problem is a simple percent chage problem. The absoluge change in price was . Relative to the original price, it was , which is or .
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During a process, the zeolite bed was exhausted after 10.5 hours and 425 litres of 0.6 N sodium chloride solution was required to restart the function of the zeolite process. Work out the hardness of hard water in ppm.
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