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

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3. What is the difference in the gain per cent. between selling goods
at 2d. which cost ld., and selling goods at 21d. which cost 2d.?
4. What sum must A bequeath to B so that B may receive ~1,000
after a legacy duty of ~10 per cent. has been deducted?
5. If an article was bought for 3s. 6d. and sold for 3s. l0 d., what
was the gain per cent.? Find also the loss per cent. if the article was
bought for 3s. 10-~d. and sold for 3s. 6d.
6. A merchant sold goods for ~75, and by doing so lost 10 per
cent., whereas in the regular course of trade he should have gained
30 per cent. How much were they sold under their proper value?
7. If 7 per cent. be gained by selling goods for ~69 1 ls., what percentage would be lost by selling them for ~61 15s.?
8. If an article be sold for 12s. 6d. there is a gain of 25 per cent.;
what would be the loss or gain if it were sold for 10s.?
9. By selling at 4- per cent. profit a tradesman gains ~47 14s.;
what was the prime cost of his goods?
10. If a tradesman mark his goods on credit 20 per cent. above
cash price, what ready money will he take for an article marked 26s.?
11. If 10 per cent. be gained on the wholesale price of an article
whose first cost is 5s. 6d., and 40 per cent. on the retail price, how
much does the purchaser of such an article pay for profits to the wholesale and retail dealers?
12. The manufacturer of an article makes a profit of 10 per cent.,
the wholesale dealer a profit of 15 per cent., and the retailer makes a
profit of 25 per cent. What is the cost to the manufacturer of an
article which is retailed for 16 shillings?
XVII.
1. What fraction of a shilling, a pound, and a guinea is a franc?
2. Supposing the value of a franc to be 9~d., and that a commission of 3d. is charged on every sovereign exchanged; find the least
number of sovereigns that can be changed with an exact number of
francs.
3. If ~1,000 be due from London to Paris when ~1 is worth 25
francs, how much must be remitted when a pound is worth 27 francs?
4. If an Indian rupee be worth 2s. 4d., how many rupees are
equal in value to ~1,000 sterling?
5. If 10 scudi be worth 52} francs, 16s. worth 20 francs, and 12
carlini worth 4s 2d., how many carlini are equivalent to 500 scudi?
6. If 12 carlini be worth 4s. ld., and a Napoleon be worth 16s.
how many carlini ought to be received for 15 Napoleons?
7. If 100 francs make ~4, and 193 thalers make 19 guineas, how
many thalers are there in 375 francs?
8. If 10 francs be worth 6 florins, and 15 florins be worth 4 moidores,
how many francs must be given for 16 moidores?
9. The exchange between London and Paris is 25- francs for one