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What is the most accurate measurement of 1 pound

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?