It then becomes a useful and practical problem to determine instantly
what per cent. he would gain if he retailed the hat at a certain
price, to tell what an article should retail for to make a profit of
20 per cent.
_Rule.--Divide what the articles cost per dozen by 10. which is done
by removing the decimal point one place to the left._
For instance, if hats cost $17.50 per dozen, remove the decimal point
one place to the left, making $1.75, what they should be sold for
apiece to gain 20 per cent, on the cost. If they cost $31.00 per
dozen, they should be sold at $3.10 apiece, etc.
THE SEVEN WONDERS OF THE WORLD.
Pyramids of Egypt.
Tower, Walls and Terrace Hanging Gardens of Babylon.
Statue of Jupiter Olympus, on the Capitoline Hill, at Rome.
Temple of Diana, at Ephesus.
Pharos, or watch-tower, at Alexandria, Egypt.
Colossus of Rhodes, a statue 105 feet high; overthrown by an
earthquake 224 B.C.
Mausoleum at Halicarnassus, a Grecian-Persian city in Asia Minor.
HEAT AND COLD.
Degrees of heat above zero at which substances melt:--Wrought iron,
3,980 degrees; cast iron, 3,479; platinum, 3,080; gold, 2,590; copper,
2,548; steel, 2,500; glass, 2,377; brass, 1,900; silver, 1,250;
antimony, 951; zinc, 740; lead, 594; tin, 421; arsenic, 365; sulphur,
226; beeswax, 151; gutta percha, 145; tallow, 97; lard, 95; pitch, 91;
ice, 33. Degrees of heat above zero at which substances boil:--Ether,
98 degrees; alcohol, 173; water, 212; petroleum, 306; linseed oil,
640; blood heat, 98; eggs hatch, 104.
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