# Cobb's Explantory Arithmetick, Number Two: Containing the Compound Rules, and All that is Necessary of Every Other Rule in Arithmetick for Practical Purposes and the Transactions of Business ... To which is Annexed a Practical System of Book-keeping

Desilver, Thomas, & Company, 1836 - Arithmetic - 216 pages
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Page 160 - But if any payments be made before one year's interest hath accrued, then compute the interest on the principal sum due on the obligation, for one year, add- it to the principal, and compute the interest on the sum paid, from the time it was paid up to the end of the year; add it to the sum paid, and deduct that sum from the principal and interest, added as above...
Page 212 - Multiply the divisor, thus augmented, by the last figure of the root, and subtract the product from the dividend, and to the remainder bring down the next period for a new dividend.
Page 168 - ... then multiply the second and third terms together, and divide their product by the first, the quotient will be the fourth term or answer, in the same denomination vj'ilh the third term.
Page 160 - If the payment be less than the interest, the surplus of the interest must not be taken to augment the principal ; but interest continues on the former principal until the period when the payments, taken together, exceed the interest due...
Page 158 - If a year extends beyond the time of payment, then find the amount of the principal...
Page 159 - The rule for casting interest, when partial payments have been made, is to apply the payment, in the first place, to the discharge of the interest then due. " If the payment exceeds the interest, the surplus goes towards discharging the principal, and the subsequent interest is to be computed on the balance of principal remaining due.
Page 154 - ... 3d. If there be parts of a year, as months and days, work for the months by the aliquot parts of a year...
Page 160 - Compute the interest to the time of the first payment ; if that be one year or more from the time the interest commenced, add it to the principal, and deduct the payment from the sum total. If there be after payments made, compute the interest on the balance due to the next payment, and then deduct the payment as above; and in like manner from one payment to another, till all the payments are absorbed; provided the time between one payment and another be one year or more.
Page 212 - Separate the given number into periods of three figures each, by putting a point over the unit figure, and every third figure beyond the place of units. 2. Find the greatest cube in the left hand period, and put its root in the quotient. 3.
Page 12 - TROY WEIGHT. 24 grains (gr.) = 1 pennyweight (pwt.). 20 pennyweights = 1 ounce (oz.). 12 ounces = 1 pound (lb.). 351. Apothecaries' weight is used in mixing medicines and in selling them at retail. APOTHECARIES