Monroe 8125 User Manual page 142

Percent
The percent key changes an amount to a
format we are more comfortable seeing.
Were we to multiply 100 by 3%, we are more
comfortable entering 100, pressing the x
key, then entering 3 and pressing the %
key. Alternatively we would have to enter the
result. The percent key also has additional
capabilities not often included. Depression of
the + or keys immediately following the % key
often yields the percent increase or percent
decrease respectively automatically.
Similar to the Percent Key the Tax key enables
us to store a tax rate and determine the effect
of applying that tax to an amount automatically.
Additionally, one can determine the net amount
can also be calculated using these functions.
Mark up
Mark up is not percent increase. The formula
for mark up is cost, divided by 100 minus the
percent of mark up. If an article costs $100 and
we were to apply a 25% mark up, the selling
price would be 133.33. From the formula we
are dividing 100 by .75.
Gross Margin
In the example above, the gross margin in
dollars would be $33.33 and the gross margin
percentage is 25%.
Percent Change
Percent Change is provided to assist in the
determination of the percent and amount of
change between two numbers. Comparing
sales last month to this month for example.
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Rounding
Calculators usually provide a choice between
3 types of rounding. They are normally referred
to as truncate, round off and round up. To
illustrate the difference, let us assume that the
actual result of adding 1.444 twice is 2.888.
If the decimal selector were set at 2, it would
instruct the calculator to round the answer to
2 decimal places. If the rounding control were
set to truncate, the answer would be 2.88 as it
would ignore any digit past two decimal places
and drop it. If the selector were instead set for
digit above and would round the answer up
to 2.89 if that third digit were 5 or greater
and would drop it off if it were 4 or less. If the
selector were set to round up, any non-zero
digit in the third decimal position would cause
the answer to be rounded up, again the answer
would be 2.89.
Calculators that provide for the summation
of x enable the operator to accumulate
amounts preceding depression of the times
key. In an invoice for example, one might want
pricing errors.
Summation of = and %
The 8125 also provides for the ability to
automatically sum the results of depressions of
the = key and or the % key. This facility saves
times and generally prevents the inadvertent
omission of moving such amounts to the
memory.
Variable Add Mode
When we discussed add mode earlier, it was