>>12536876In one case, of Canada, they abolished the
use of their pennies in order to save costs of
producing them. This resulted in the prices being
rounded to the nearest five cents or more.
Economic impact was significant due to savings
of taxpayer money and hasn't bothered the
people a bit.
In general, rounding numbers to a certain place
value makes estimation easier for calculations.
However, the numbers would be granular to the
extent of how precise one wants their number.
Science is all about accuracy and precision
and would deal with as many significant digits
as possible for their numbers.
For example, you're in the store buying some
stuff and the total is $12.43. You rounded down
to $10.00. It's accurate of what you would pay,
but it's not precise enough to get your stuff.
$20.00, on the other hand, is rather much and
you'll get your stuff, provided the store has
plenty of change to give back to you. Otherwise,
they are more inclined to round up for the profit.
Scientifically, $12.43 is the best amount to pay
for the stuff as it is significant and meaningful
to you and the store (and no other amount
works otherwise).
