Answer:
5 computers
Explanation:
You want an estimate of the number of $680 computers a club can buy with $3472.
Estimate
An estimate is often accomplished by rounding the numbers involved to 1 or 2 significant digits.
Here, we can estimate the number of computers by rounding the money available to $3500, and the cost of a computer to $700. The first estimate is then ...
$3500/($700/computer) = 5 computers
We estimate the club can buy 5 computers.
Sometimes, this will give a value that is higher or lower than the actual number.
Refined estimate
There are a couple of ways we can refine this estimate.
1. Look at fractional changes
The number 3472 was rounded up to 3500, an increase of 28, or about 30/3500, < 1%.
The number 680 was rounded up to 700, an increase of 20, or about 20/680 ≈ 3%.
Since we rounded the cost up by a greater fraction than the money available, our estimate is a little low, maybe by about 3% -1% or 2%.
2. Estimate the actual cost
Our cost value is rounded up by $20, so the cost of 5 computers will be 5×$20 = $100 less than our estimated cost. That means they will actually cost $3500 -100 = 3400, which is less than the 3472 available.
Either of these methods of refining our estimate tells us that the club can buy 5 computers.
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