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The annual number of burglaries in a town rose by 40% in 2012 and fell by 30% in 2013. Hence the total number of burglaries

The annual number of burglaries in a town rose by 40% in 2012 and fell by 30% in 2013. Hence the total number of burglaries increased by 10% over the twoyear period.

a.What is the mistaken assumption here?

b.Why is that assumption incorrect?

c.By what percent has the number of burglaries actually changed in the two year period?

d.By what percent would the crime have to decrease in the second year in order for the change over the two-year period to actually be a 10% increase?

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