Εικόνες σελίδας
PDF
Ηλεκτρ. έκδοση

Case I.

To find the present worth of a sum due some time hence. RULE. As the amount of 100 dollars for the given time and rate, is to 100, so is the given sum to its present worth.

[blocks in formation]

To find the discount of any sum due some time hence.

RULE.-Find the present worth and subtract it from the given sum; or say, as the amount of 100 dollars for the given time and rate, is to the interest of 100 dollars for the given time and rate, so is the given sum to the discount required.

[blocks in formation]

4. Commission, Brokerage and Ensurance.

1. COMMISSION is an allowance of so much per cent, to an agent abroad, for buying and selling goods for his employer.

2. BROKERAGE is an allowance of so much per cent. to a person called a Broker, for assisting merchants and others in procuring and disposing of their goods, &c.

3. INSURANCE is a premium of so much per cent. given to certain persons, or companies, for a security for making good the loss of ships, buildings, goods, &c. which may happen by fire, storms, &c.*

Rule.

Commission, Brokerage and Insurance are calculated by the fir rule given for computing Simple Interest.

Examples.

1. What must I allow for selling 525 dollars. worth of Goods, at 3 per cent. commission ?

525
3,

15.75 Ans.

4. If I allow my Broker 34 per cent. what must I allow him for purchasing 2525 dolls. worth of goods?

Ans. $88 37 cts.. 5 m.

5. What is the insurance of a

2. What comes the commis-house, worth 3460 dollars, at

sion of 827 dolls. 64 cts. to, at 21 per cent ?

Ans. 20 dolls. 69 cts. 1 m. 3. What is the brokerage of £610, at per cent ?

Ans.

1 10 s. 6 d.

[blocks in formation]

per cent ?

Ans. 17 30 cts.

6. What is the insurance of £1200, at 7 per cent?

QUESTIONS.

Ans. £90.

4. What is the rule for computing Commission, Brokerage, and Insurance?

* Insurance is made by a writing called a policy, which should always be sufficient to cover the principal and premium; that is, a policy to secure the payment of 100 dollars, at 6 per cent. must be taken out for 106 dollars.

SECTION VI.

1. Practice.*

PRACTICE is a contraction of the Rule of Three when the first term is a unit. It took its name from its daily use among merchants. The necessity of this rule is nearly superceded by the use of Federal Money.

Rule.

1. Suppose the price of the given quantity to be £1, 1 s. 1 d. or I qr. per pound, yard, &c. as is most convenient, then the quantity itself will be the answer at the supposed price.

2. Divide the given price into aliquot parts, either of the supposed price, or of one another, and the sum of the quotients belonging to each, will be the true answer required.

PROOF. By the Rule of Three.

Table of aliquot parts of Money.

[merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][ocr errors][ocr errors][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][ocr errors][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][merged small][ocr errors][merged small][ocr errors][ocr errors]

*Practice admits of a great number of cases. But as the rule is losing its importance, and going out of use in consequence of the introduction of Federal Money, it was thought best to introduce one general rule, and not perplex the scholar with a multiplicity of almost useless cases. This rule, with a little attention, will readily be applied to the solution of all questions which belong to it. When there is a fractional part of a pound or yard, take an equal part of the price of one yard, that is, for one half, take half the price; for one fourth, take one fourth; for three fourths, take three fourths of the price of one pound or yard.

[blocks in formation]

2. Care and Trett.

TARE AND TRETT are practical for deducting certain allowances which are made by merchants and tradesmen in selling their goods by weight.

Gross weight is the whole weight of any sort of goods, together with the box, cask, or bag, &c. that contains them.

Tare is an allowance to the buyer, for the weight of the box, cask, or bag, &c. which contains the goods bought.

Trett is an allowance of 4 lb. in every 104 lb. for waste, dust, &c. Cloff is an allowance of 2 lb. on every 3 cwt.

Suttle is the weight when part of the allowance is deducted from the gross.

Net weight is what remains after the allowances are made.

Case I.

When Tare is so much per box, cask, &c. RULE.-Multiply the number of boxes, &c. by the tare, subtract it from the gross, and the remainder will be the net weight.

[blocks in formation]

RULE.--Divide the gross weight by the aliquot parts of a cwt. contained in the tare, and subtract the quotient from the gross, the remainder is the net weight.

[blocks in formation]
« ΠροηγούμενηΣυνέχεια »