Sacramento daily record-union. [volume] (Sacramento [Calif.]) 1875-1891, 1884-08-16

| three together, we would, of course, get
| 81 ,04S.13.41, the interest at "a per cent per
! annum, it agreeing exactly with the result
obtained by calculating the interest by
months and days.
| The inverted comma still fulfilling its
! office, " thework," brought together, in COM
putting the interest by days would stand
like this:
Principal,
ST. $500. Interest
Interest for 1000 days at per cent 81 At Go CSC
Interest for COO days at per cent. 72s so 600
Interest for 90 days at per cent. 72SS 600
Interest for days at per cent. 72S. 500
Interest for days at per CENT. 242T76
Interest for 2,66s days at per cent So so 7s2
Interest at per cent.................. 5Se l22
Interest at 4 of per cent. 269 81 Sol
Interest at ~ per cent per annum 81 ,04s ID AS
If we should disregard the qualification
and proceed on the letter of the rule that q
month contains 30 and year $50 days, we
should lose the interest on our principal
for So days or S5310.32. am not school
teacher-not even Il fair mathematician
but l am glad that Professor Atkinson,
both in the schOol-room and in his book.
is teaching the method of calculating in
terest that | have endeavored to explain
1t is 4 complete labor-Saving machine, and
saves as much time as labor | have
looked over the shoulders of expert inter-
est calculators, and, while they were toll
ing along unde: the old system. | have
often performed the work mentally, and
set down the answer by the time they got
half through. Again, if one learns a
method OF calculating interest, no differ
ence how tedious or time-eating il is, he
will stick to it all his life
l,,, IT,
lating interest that is any more exact than
the true number of days and divide them
by 6,000-being certain that the uuotient
shall always have two more figures than
there are dollar figures in the principal
whose interest you are required to find
The second rule is simply the principle of
the first one carried to practical perfection.
1t is equally applicable to large and small
principals and TO long and short periods of
time. 1t inSures the obtainment of the
interest at 6 per cent. per annum within a
fraction of mill. From the interest at
that rate any other rate of interest is obtain
able. Under the last rule the example that
we have had in hand would present this
form; 1858 6,000><S7, 2S3=$3, 23S 80. "a
interest at 6 per cent. per annum, which,
$3.50. IS o. 1868 81 .52-S4, OASIS, interest nj
I! per cent per annum.
Suppose you were asked to find the in
terest on s. ,2S3, at u per cent, for 30 days |
Under the rule we are now considering it |
would take this form: So 6,00OX$7, 2S3=
S42 As, interest at 6 per cent, and $42.4S-E |
81 ,0S+ $3,54-$53.10 with a fraction of |
mills), the interest at I! per cent.
Because matter of this kind is seldom |
found outside of educational journals. and |
because a paper like the RECoRD-UNIoN |
has thousand readers where an ordinary |
school magazine has one, and for the fur |
Their reason that, if you should publish it, |
it is certain to meet the eye of inquiring |
youth, constitute my excuses for the 100 |
great length of this paper. BRIcRLAYER.
Stockton, August :, 1884.