Using proportions, it is found that the rate of 31 mills means that their property tax is of 3.1%.
A proportion is a fraction of a total amount.
The Staff family pays a rate of 31 mills in property tax, which means that for each $1000, $31 is paid in tax. Hence the rate is given by:
r = 31/1000 = 3.1/100 = 3.1%.
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