It is an estimate that is quite safe
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A safe estimate is always rounded up to be "safe" (i.e. Estimating the total miles of a trip with a 22 mile leg and a 34 mile leg would be done using 25 and 35). An ordinary estimate is just rounding to the nearest whole digit to estimate (i.e. Estimating the total miles of a trip with a 22 mile leg and a 34 mile leg would be done using 20 and 35).
The estimate for 15,772 is 10,000
It could estimate to 480 or even 500, depending on what way you want to estimate it to.
An upper bound estimate is a estimate that is greater than the actual solution.
The front end estimate is 600.