Elementary arithmetic, with brief notices of its history... by Robert Potts.

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his outlay, he then raises the price to 6s.; what does he clear per cent.
by the latter price?
7. If 14 per cent. be lost in the sale of goods for 8s.; what was
the loss per cent. if sold for 7s. 6d.?
8. If 5 per cent. be lost in selling cloth at 10s. a yard; how much
is gained or lost per cent. by selling it at 12s. 6d. a yard?
9. In a sale of goods for ~182 there is a loss of 9 per cent.; for
what must 3 times the quantity be sold in order to gain 7 per cent.?
10. If 20 per cent. be gained by selling an article for 10s. 6d.;
what is the gain or loss per cent. when it is sold for 8s.?
11. When goods are sold for ~80, the gain per cent. is 10; what
should be the price of an equal quantity of the same article that the
gain per cent. might be 19?
12. Goods are bought for ~142. 10s., and sold for ~163. 13s. lld.;
what is the gain per cent.?
13. A grocer had 1501b. of tea, of which he sold 501b. at 9s. per
pound, and found he was gaining only 7~ per cent. But he wished to
gain 10 per cent. on the whole. At what rate must the remaining
0llb. be sold that he may attain his wishes?
XVI.
1. A tradesman adds 35 per cent. to the cost price of his goods, and
gives his customers a reduction of 10 per cent. on their bills; what
profit does he make?
2. A merchant bought goods for ~170, and sold them again for
~210 to be paid at the end of nine months. What was his gain in
ready money discounting at 6 per cent.?
3. A tradesman finds that if he asks for his goods 15 per cent.
above the wholesale price, he can sell his whole stock in 4 months,
whereas if he asks 20 per cent. he requires 6 months to sell the same
amount. Which will he find the more profitable system at the year's
end?
4. A bill of ~630 due a year hence can be taken up now at
5 per cent. discount. Supposing that a tradesman can employ his
capital so as to obtain interest at the end of every quarter at the rate
of 4- per cent. per annum, had he better so employ it, or take up the
bill? and what will be the difference to him?
5. A tradesman marks his goods with two prices, one for ready
money, and the other for one year's credit, allowing discount at 5 per
cent. If the credit price be marked 12s. 3d., what ought to be the
cash price?
6. If a manufacturer sell an article of which the first cost is ~100
to a wholesale dealer at 10 per cent. profit, the wholesale dealer to the
retailer at 15 per cent. profit, and the retailer to the consumer at 30
per cent. profit; what sum is paid by the consumer as profits ia
addition to the first cost of the article?