To find the value of articles sold by the unit, hundred or thousand.
RULE.--Multiply the quantity by the price, or vice versa, and point off
the proper number of decimal places in the result.
Find the cost of a bale (518 pounds) of cotton at 7-3/8c per pound.
518 × .07 = 36.26
„ .00-3/8 = 1.94-1/4
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_Ans._ $38.20-1/4
At 7c (.07) per pound, 518 pounds cost $36.26; at 3/8c, $1.94-1/4. For
3/8 of 518, multiply by 3, and divide product by 8.
Find cost of a lot of hogs, weighing 8740 pounds, at $4.35 per
hundredweight.
87.40
4.35
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380.1900
The price being $4.35 per 100 pounds and as in 8740 pounds there are
87.40 hundredweight, four decimal places are pointed off. _Ans._
$380.19.
Find the cost of 2864 feet of lumber, at $17-1/4 per 1000 feet.
Price being dollars per 1000, point off three places. (2.864 × 17-1/4 =
49.404.) _Ans._ $49.40.
To find the value of articles sold by the ton (2000 pounds).
RULE.--Multiply the weight by the price and take half of the product.
Find the cost of 2680 pounds of hay, at $11-1/2 per ton.
Point off three places, when price is dollars; five if dollars and
cents. (2680 × 11-1/2 = 30820; 30820 ÷ 2 = 15.410.) _Ans._ $15.41.
When the long ton of 2240 pounds is used.
RULE.--Multiply the weight by the price and divide the product by 2.240.
Find the cost of 4800 pounds coal, at $6-3/4 per long ton. (4800 ×
6-3/4) ÷ 2.24 = $14.46, _Ans._
To find the cost of grain, when the price per bushel and weight is
given.
RULE.--Reduce the weight to bushels, and multiply by the price.
Find the cost of 3570 pounds of shelled corn, at 36c per bushel.
56)3570(63.75 bu.
.36
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_Ans._ $22.9500
To reduce pounds of shelled corn to bushels, divide by 56. At 36c per
bushel, 63.75 bushels come to $22.95.
Find cost of 2900 pounds of wheat, at 57c per bushel.
To reduce pounds of wheat to bushels divide by 60. 2900 ÷ 60 = 48-1/3
bushels; 48-1/3 × .57 = $27.55, _Ans._
In computing the value of grain, the operation can often be abbreviated
by cancellation.
RULE.--Write the weight and price per bushel, on the right of a vertical
line, and the number of pounds to the bushel on the left. Then cancel
common factors, as explained above.
Find the cost of 3230 bushels of wheat, at 72c per bushel.
60 ¦ 3230
¦ 72 12
323 × 12 = 38.76
Here we cancel the 0’s on both sides; then, 6 and 72, which leaves 323
and 12. Their product being the answer.
At 28c per bushel, what will 4080 pounds of oats cost?
32 ¦ 4080 510
4 ¦ 28 7
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_Ans._ $35.70
Oats, 32 pounds to the bushel. See table, page 861. Cancel 32 and 4080,
then, 4 and 28, leaving the factors 510 and 7.
Other short cuts for computing cost of merchandise, produce, etc.
Find cost of 26-1/2 dozen eggs, at 18-1/2c a dozen.
26 × 18 = 4.68
1/2 of 44 = .22
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1/2 × 1/2 = 1/4 4.90-1/4
_Ans._ $4.90.
When both fractions are 1/2. To product of the whole numbers, add 1/2 of
their sum, and annex 1/4 to answer.
Of 53-3/4 pounds of butter, at 28-3/4c per pound.
53 × .28 = 14.84
3/4 of 81 = .60-3/4
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3/4 × 3/4 = 9/16 15.45
_Ans._ $15.45-9/16.
To the product of the whole numbers, add 3/4 of their sum, plus the
square of 3/4.
Of 13-1/4 yards of flannel, at 31-1/4c per yard.