exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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? A cyclist traveling at a constant speed completes 3/5 of a trip in 1 1/2 hrs. In how many additional hours will the cyclist complete the entire trip?