exam Maths Puzzle Numerical Ability

The crowd that heard the President speak was estimated to be 10,000 people. The actual crowd could be 750 people more or less than this. What are the possible values for the actual crowd size?

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Biologists want to set up a station to test alligators in the lake for West Nile Virus. Suppose that the cost for such a station are $2,500 for set up costs and $3.00 to administer A silver coin was purchased for $430 in 1985.The market value for silver declined to the point that in 2007 the coin was worth $200. What was the average annual rate of depreciation of the silver coin?